mirror of
https://github.com/kennethreitz/requests.git
synced 2026-06-05 22:50:18 +00:00
rip 2.7.x collections out
This commit is contained in:
Kenneth Reitz
@@ -0,0 +1,991 @@
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from __future__ import with_statement
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# Copyright 2007 Google, Inc. All Rights Reserved.
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# Licensed to PSF under a Contributor Agreement.
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"""Abstract Base Classes (ABCs) according to PEP 3119."""
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import types
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from _weakref import ref
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__all__ = ['WeakSet']
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class _IterationGuard(object):
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# This context manager registers itself in the current iterators of the
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# weak container, such as to delay all removals until the context manager
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# exits.
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# This technique should be relatively thread-safe (since sets are).
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def __init__(self, weakcontainer):
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# Don't create cycles
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self.weakcontainer = ref(weakcontainer)
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def __enter__(self):
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w = self.weakcontainer()
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if w is not None:
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w._iterating.add(self)
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return self
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def __exit__(self, e, t, b):
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w = self.weakcontainer()
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if w is not None:
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s = w._iterating
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s.remove(self)
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if not s:
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w._commit_removals()
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class WeakSet(object):
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def __init__(self, data=None):
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self.data = set()
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def _remove(item, selfref=ref(self)):
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self = selfref()
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if self is not None:
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if self._iterating:
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self._pending_removals.append(item)
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else:
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self.data.discard(item)
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self._remove = _remove
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# A list of keys to be removed
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self._pending_removals = []
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self._iterating = set()
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if data is not None:
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self.update(data)
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def _commit_removals(self):
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l = self._pending_removals
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discard = self.data.discard
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while l:
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discard(l.pop())
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def __iter__(self):
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with _IterationGuard(self):
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for itemref in self.data:
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item = itemref()
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if item is not None:
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yield item
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def __len__(self):
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return sum(x() is not None for x in self.data)
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def __contains__(self, item):
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try:
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wr = ref(item)
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except TypeError:
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return False
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return wr in self.data
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def __reduce__(self):
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return (self.__class__, (list(self),),
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getattr(self, '__dict__', None))
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__hash__ = None
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def add(self, item):
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if self._pending_removals:
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self._commit_removals()
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self.data.add(ref(item, self._remove))
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def clear(self):
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if self._pending_removals:
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self._commit_removals()
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self.data.clear()
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def copy(self):
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return self.__class__(self)
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def pop(self):
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if self._pending_removals:
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self._commit_removals()
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while True:
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try:
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itemref = self.data.pop()
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except KeyError:
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raise KeyError('pop from empty WeakSet')
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item = itemref()
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if item is not None:
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return item
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def remove(self, item):
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if self._pending_removals:
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self._commit_removals()
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self.data.remove(ref(item))
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def discard(self, item):
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if self._pending_removals:
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self._commit_removals()
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self.data.discard(ref(item))
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def update(self, other):
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if self._pending_removals:
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self._commit_removals()
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if isinstance(other, self.__class__):
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self.data.update(other.data)
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else:
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for element in other:
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self.add(element)
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def __ior__(self, other):
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self.update(other)
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return self
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# Helper functions for simple delegating methods.
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def _apply(self, other, method):
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if not isinstance(other, self.__class__):
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other = self.__class__(other)
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newdata = method(other.data)
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newset = self.__class__()
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newset.data = newdata
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return newset
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def difference(self, other):
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return self._apply(other, self.data.difference)
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__sub__ = difference
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def difference_update(self, other):
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if self._pending_removals:
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self._commit_removals()
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if self is other:
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self.data.clear()
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else:
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self.data.difference_update(ref(item) for item in other)
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def __isub__(self, other):
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if self._pending_removals:
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self._commit_removals()
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if self is other:
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self.data.clear()
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else:
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self.data.difference_update(ref(item) for item in other)
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return self
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def intersection(self, other):
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return self._apply(other, self.data.intersection)
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__and__ = intersection
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def intersection_update(self, other):
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if self._pending_removals:
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self._commit_removals()
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self.data.intersection_update(ref(item) for item in other)
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def __iand__(self, other):
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if self._pending_removals:
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self._commit_removals()
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self.data.intersection_update(ref(item) for item in other)
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return self
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def issubset(self, other):
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return self.data.issubset(ref(item) for item in other)
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__lt__ = issubset
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def __le__(self, other):
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return self.data <= set(ref(item) for item in other)
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def issuperset(self, other):
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return self.data.issuperset(ref(item) for item in other)
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__gt__ = issuperset
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def __ge__(self, other):
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return self.data >= set(ref(item) for item in other)
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def __eq__(self, other):
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if not isinstance(other, self.__class__):
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return NotImplemented
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return self.data == set(ref(item) for item in other)
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def symmetric_difference(self, other):
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return self._apply(other, self.data.symmetric_difference)
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__xor__ = symmetric_difference
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def symmetric_difference_update(self, other):
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if self._pending_removals:
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self._commit_removals()
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if self is other:
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self.data.clear()
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else:
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self.data.symmetric_difference_update(ref(item) for item in other)
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def __ixor__(self, other):
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if self._pending_removals:
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self._commit_removals()
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if self is other:
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self.data.clear()
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else:
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self.data.symmetric_difference_update(ref(item) for item in other)
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return self
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def union(self, other):
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return self._apply(other, self.data.union)
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__or__ = union
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def isdisjoint(self, other):
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return len(self.intersection(other)) == 0
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# Instance of old-style class
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class _C: pass
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_InstanceType = type(_C())
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def abstractmethod(funcobj):
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"""A decorator indicating abstract methods.
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Requires that the metaclass is ABCMeta or derived from it. A
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class that has a metaclass derived from ABCMeta cannot be
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instantiated unless all of its abstract methods are overridden.
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The abstract methods can be called using any of the normal
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'super' call mechanisms.
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Usage:
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class C:
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__metaclass__ = ABCMeta
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@abstractmethod
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def my_abstract_method(self, ...):
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...
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"""
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funcobj.__isabstractmethod__ = True
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return funcobj
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class abstractproperty(property):
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"""A decorator indicating abstract properties.
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Requires that the metaclass is ABCMeta or derived from it. A
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class that has a metaclass derived from ABCMeta cannot be
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instantiated unless all of its abstract properties are overridden.
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The abstract properties can be called using any of the normal
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'super' call mechanisms.
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Usage:
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class C:
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__metaclass__ = ABCMeta
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@abstractproperty
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def my_abstract_property(self):
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...
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This defines a read-only property; you can also define a read-write
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abstract property using the 'long' form of property declaration:
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class C:
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__metaclass__ = ABCMeta
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def getx(self): ...
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def setx(self, value): ...
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x = abstractproperty(getx, setx)
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"""
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__isabstractmethod__ = True
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class ABCMeta(type):
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"""Metaclass for defining Abstract Base Classes (ABCs).
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Use this metaclass to create an ABC. An ABC can be subclassed
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directly, and then acts as a mix-in class. You can also register
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unrelated concrete classes (even built-in classes) and unrelated
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ABCs as 'virtual subclasses' -- these and their descendants will
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be considered subclasses of the registering ABC by the built-in
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issubclass() function, but the registering ABC won't show up in
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their MRO (Method Resolution Order) nor will method
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implementations defined by the registering ABC be callable (not
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even via super()).
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"""
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# A global counter that is incremented each time a class is
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# registered as a virtual subclass of anything. It forces the
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# negative cache to be cleared before its next use.
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_abc_invalidation_counter = 0
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def __new__(mcls, name, bases, namespace):
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cls = super(ABCMeta, mcls).__new__(mcls, name, bases, namespace)
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# Compute set of abstract method names
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abstracts = set(name
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for name, value in namespace.items()
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if getattr(value, "__isabstractmethod__", False))
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for base in bases:
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for name in getattr(base, "__abstractmethods__", set()):
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value = getattr(cls, name, None)
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if getattr(value, "__isabstractmethod__", False):
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abstracts.add(name)
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cls.__abstractmethods__ = frozenset(abstracts)
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# Set up inheritance registry
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cls._abc_registry = WeakSet()
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cls._abc_cache = WeakSet()
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cls._abc_negative_cache = WeakSet()
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cls._abc_negative_cache_version = ABCMeta._abc_invalidation_counter
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return cls
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def register(cls, subclass):
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"""Register a virtual subclass of an ABC."""
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if not isinstance(subclass, (type, types.ClassType)):
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raise TypeError("Can only register classes")
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if issubclass(subclass, cls):
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return # Already a subclass
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# Subtle: test for cycles *after* testing for "already a subclass";
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# this means we allow X.register(X) and interpret it as a no-op.
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if issubclass(cls, subclass):
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# This would create a cycle, which is bad for the algorithm below
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raise RuntimeError("Refusing to create an inheritance cycle")
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cls._abc_registry.add(subclass)
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ABCMeta._abc_invalidation_counter += 1 # Invalidate negative cache
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def _dump_registry(cls, file=None):
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"""Debug helper to print the ABC registry."""
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print >> file, "Class: %s.%s" % (cls.__module__, cls.__name__)
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print >> file, "Inv.counter: %s" % ABCMeta._abc_invalidation_counter
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for name in sorted(cls.__dict__.keys()):
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if name.startswith("_abc_"):
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value = getattr(cls, name)
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print >> file, "%s: %r" % (name, value)
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def __instancecheck__(cls, instance):
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"""Override for isinstance(instance, cls)."""
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# Inline the cache checking when it's simple.
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subclass = getattr(instance, '__class__', None)
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if subclass is not None and subclass in cls._abc_cache:
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return True
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subtype = type(instance)
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# Old-style instances
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if subtype is _InstanceType:
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subtype = subclass
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if subtype is subclass or subclass is None:
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if (cls._abc_negative_cache_version ==
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ABCMeta._abc_invalidation_counter and
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subtype in cls._abc_negative_cache):
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return False
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# Fall back to the subclass check.
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return cls.__subclasscheck__(subtype)
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return (cls.__subclasscheck__(subclass) or
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cls.__subclasscheck__(subtype))
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def __subclasscheck__(cls, subclass):
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"""Override for issubclass(subclass, cls)."""
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# Check cache
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if subclass in cls._abc_cache:
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return True
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# Check negative cache; may have to invalidate
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if cls._abc_negative_cache_version < ABCMeta._abc_invalidation_counter:
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# Invalidate the negative cache
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cls._abc_negative_cache = WeakSet()
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cls._abc_negative_cache_version = ABCMeta._abc_invalidation_counter
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elif subclass in cls._abc_negative_cache:
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return False
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# Check the subclass hook
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ok = cls.__subclasshook__(subclass)
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if ok is not NotImplemented:
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assert isinstance(ok, bool)
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if ok:
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cls._abc_cache.add(subclass)
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else:
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cls._abc_negative_cache.add(subclass)
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return ok
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# Check if it's a direct subclass
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if cls in getattr(subclass, '__mro__', ()):
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cls._abc_cache.add(subclass)
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return True
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# Check if it's a subclass of a registered class (recursive)
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for rcls in cls._abc_registry:
|
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if issubclass(subclass, rcls):
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cls._abc_cache.add(subclass)
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return True
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# Check if it's a subclass of a subclass (recursive)
|
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for scls in cls.__subclasses__():
|
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if issubclass(subclass, scls):
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cls._abc_cache.add(subclass)
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return True
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# No dice; update negative cache
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cls._abc_negative_cache.add(subclass)
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return False
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|
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|
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|
||||
|
||||
|
||||
|
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|
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import sys
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### ONE-TRICK PONIES ###
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def _hasattr(C, attr):
|
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try:
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return any(attr in B.__dict__ for B in C.__mro__)
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except AttributeError:
|
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# Old-style class
|
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return hasattr(C, attr)
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class Hashable:
|
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__metaclass__ = ABCMeta
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|
||||
@abstractmethod
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def __hash__(self):
|
||||
return 0
|
||||
|
||||
@classmethod
|
||||
def __subclasshook__(cls, C):
|
||||
if cls is Hashable:
|
||||
try:
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for B in C.__mro__:
|
||||
if "__hash__" in B.__dict__:
|
||||
if B.__dict__["__hash__"]:
|
||||
return True
|
||||
break
|
||||
except AttributeError:
|
||||
# Old-style class
|
||||
if getattr(C, "__hash__", None):
|
||||
return True
|
||||
return NotImplemented
|
||||
|
||||
|
||||
class Iterable:
|
||||
__metaclass__ = ABCMeta
|
||||
|
||||
@abstractmethod
|
||||
def __iter__(self):
|
||||
while False:
|
||||
yield None
|
||||
|
||||
@classmethod
|
||||
def __subclasshook__(cls, C):
|
||||
if cls is Iterable:
|
||||
if _hasattr(C, "__iter__"):
|
||||
return True
|
||||
return NotImplemented
|
||||
|
||||
Iterable.register(str)
|
||||
|
||||
|
||||
class Iterator(Iterable):
|
||||
|
||||
@abstractmethod
|
||||
def next(self):
|
||||
raise StopIteration
|
||||
|
||||
def __iter__(self):
|
||||
return self
|
||||
|
||||
@classmethod
|
||||
def __subclasshook__(cls, C):
|
||||
if cls is Iterator:
|
||||
if _hasattr(C, "next") and _hasattr(C, "__iter__"):
|
||||
return True
|
||||
return NotImplemented
|
||||
|
||||
|
||||
class Sized:
|
||||
__metaclass__ = ABCMeta
|
||||
|
||||
@abstractmethod
|
||||
def __len__(self):
|
||||
return 0
|
||||
|
||||
@classmethod
|
||||
def __subclasshook__(cls, C):
|
||||
if cls is Sized:
|
||||
if _hasattr(C, "__len__"):
|
||||
return True
|
||||
return NotImplemented
|
||||
|
||||
|
||||
class Container:
|
||||
__metaclass__ = ABCMeta
|
||||
|
||||
@abstractmethod
|
||||
def __contains__(self, x):
|
||||
return False
|
||||
|
||||
@classmethod
|
||||
def __subclasshook__(cls, C):
|
||||
if cls is Container:
|
||||
if _hasattr(C, "__contains__"):
|
||||
return True
|
||||
return NotImplemented
|
||||
|
||||
|
||||
class Callable:
|
||||
__metaclass__ = ABCMeta
|
||||
|
||||
@abstractmethod
|
||||
def __call__(self, *args, **kwds):
|
||||
return False
|
||||
|
||||
@classmethod
|
||||
def __subclasshook__(cls, C):
|
||||
if cls is Callable:
|
||||
if _hasattr(C, "__call__"):
|
||||
return True
|
||||
return NotImplemented
|
||||
|
||||
|
||||
### SETS ###
|
||||
|
||||
|
||||
class Set(Sized, Iterable, Container):
|
||||
"""A set is a finite, iterable container.
|
||||
|
||||
This class provides concrete generic implementations of all
|
||||
methods except for __contains__, __iter__ and __len__.
|
||||
|
||||
To override the comparisons (presumably for speed, as the
|
||||
semantics are fixed), all you have to do is redefine __le__ and
|
||||
then the other operations will automatically follow suit.
|
||||
"""
|
||||
|
||||
def __le__(self, other):
|
||||
if not isinstance(other, Set):
|
||||
return NotImplemented
|
||||
if len(self) > len(other):
|
||||
return False
|
||||
for elem in self:
|
||||
if elem not in other:
|
||||
return False
|
||||
return True
|
||||
|
||||
def __lt__(self, other):
|
||||
if not isinstance(other, Set):
|
||||
return NotImplemented
|
||||
return len(self) < len(other) and self.__le__(other)
|
||||
|
||||
def __gt__(self, other):
|
||||
if not isinstance(other, Set):
|
||||
return NotImplemented
|
||||
return other < self
|
||||
|
||||
def __ge__(self, other):
|
||||
if not isinstance(other, Set):
|
||||
return NotImplemented
|
||||
return other <= self
|
||||
|
||||
def __eq__(self, other):
|
||||
if not isinstance(other, Set):
|
||||
return NotImplemented
|
||||
return len(self) == len(other) and self.__le__(other)
|
||||
|
||||
def __ne__(self, other):
|
||||
return not (self == other)
|
||||
|
||||
@classmethod
|
||||
def _from_iterable(cls, it):
|
||||
'''Construct an instance of the class from any iterable input.
|
||||
|
||||
Must override this method if the class constructor signature
|
||||
does not accept an iterable for an input.
|
||||
'''
|
||||
return cls(it)
|
||||
|
||||
def __and__(self, other):
|
||||
if not isinstance(other, Iterable):
|
||||
return NotImplemented
|
||||
return self._from_iterable(value for value in other if value in self)
|
||||
|
||||
def isdisjoint(self, other):
|
||||
for value in other:
|
||||
if value in self:
|
||||
return False
|
||||
return True
|
||||
|
||||
def __or__(self, other):
|
||||
if not isinstance(other, Iterable):
|
||||
return NotImplemented
|
||||
chain = (e for s in (self, other) for e in s)
|
||||
return self._from_iterable(chain)
|
||||
|
||||
def __sub__(self, other):
|
||||
if not isinstance(other, Set):
|
||||
if not isinstance(other, Iterable):
|
||||
return NotImplemented
|
||||
other = self._from_iterable(other)
|
||||
return self._from_iterable(value for value in self
|
||||
if value not in other)
|
||||
|
||||
def __xor__(self, other):
|
||||
if not isinstance(other, Set):
|
||||
if not isinstance(other, Iterable):
|
||||
return NotImplemented
|
||||
other = self._from_iterable(other)
|
||||
return (self - other) | (other - self)
|
||||
|
||||
# Sets are not hashable by default, but subclasses can change this
|
||||
__hash__ = None
|
||||
|
||||
def _hash(self):
|
||||
"""Compute the hash value of a set.
|
||||
|
||||
Note that we don't define __hash__: not all sets are hashable.
|
||||
But if you define a hashable set type, its __hash__ should
|
||||
call this function.
|
||||
|
||||
This must be compatible __eq__.
|
||||
|
||||
All sets ought to compare equal if they contain the same
|
||||
elements, regardless of how they are implemented, and
|
||||
regardless of the order of the elements; so there's not much
|
||||
freedom for __eq__ or __hash__. We match the algorithm used
|
||||
by the built-in frozenset type.
|
||||
"""
|
||||
MAX = sys.maxint
|
||||
MASK = 2 * MAX + 1
|
||||
n = len(self)
|
||||
h = 1927868237 * (n + 1)
|
||||
h &= MASK
|
||||
for x in self:
|
||||
hx = hash(x)
|
||||
h ^= (hx ^ (hx << 16) ^ 89869747) * 3644798167
|
||||
h &= MASK
|
||||
h = h * 69069 + 907133923
|
||||
h &= MASK
|
||||
if h > MAX:
|
||||
h -= MASK + 1
|
||||
if h == -1:
|
||||
h = 590923713
|
||||
return h
|
||||
|
||||
Set.register(frozenset)
|
||||
|
||||
|
||||
class MutableSet(Set):
|
||||
|
||||
@abstractmethod
|
||||
def add(self, value):
|
||||
"""Add an element."""
|
||||
raise NotImplementedError
|
||||
|
||||
@abstractmethod
|
||||
def discard(self, value):
|
||||
"""Remove an element. Do not raise an exception if absent."""
|
||||
raise NotImplementedError
|
||||
|
||||
def remove(self, value):
|
||||
"""Remove an element. If not a member, raise a KeyError."""
|
||||
if value not in self:
|
||||
raise KeyError(value)
|
||||
self.discard(value)
|
||||
|
||||
def pop(self):
|
||||
"""Return the popped value. Raise KeyError if empty."""
|
||||
it = iter(self)
|
||||
try:
|
||||
value = next(it)
|
||||
except StopIteration:
|
||||
raise KeyError
|
||||
self.discard(value)
|
||||
return value
|
||||
|
||||
def clear(self):
|
||||
"""This is slow (creates N new iterators!) but effective."""
|
||||
try:
|
||||
while True:
|
||||
self.pop()
|
||||
except KeyError:
|
||||
pass
|
||||
|
||||
def __ior__(self, it):
|
||||
for value in it:
|
||||
self.add(value)
|
||||
return self
|
||||
|
||||
def __iand__(self, it):
|
||||
for value in (self - it):
|
||||
self.discard(value)
|
||||
return self
|
||||
|
||||
def __ixor__(self, it):
|
||||
if it is self:
|
||||
self.clear()
|
||||
else:
|
||||
if not isinstance(it, Set):
|
||||
it = self._from_iterable(it)
|
||||
for value in it:
|
||||
if value in self:
|
||||
self.discard(value)
|
||||
else:
|
||||
self.add(value)
|
||||
return self
|
||||
|
||||
def __isub__(self, it):
|
||||
if it is self:
|
||||
self.clear()
|
||||
else:
|
||||
for value in it:
|
||||
self.discard(value)
|
||||
return self
|
||||
|
||||
MutableSet.register(set)
|
||||
|
||||
|
||||
### MAPPINGS ###
|
||||
|
||||
|
||||
class Mapping(Sized, Iterable, Container):
|
||||
|
||||
@abstractmethod
|
||||
def __getitem__(self, key):
|
||||
raise KeyError
|
||||
|
||||
def get(self, key, default=None):
|
||||
try:
|
||||
return self[key]
|
||||
except KeyError:
|
||||
return default
|
||||
|
||||
def __contains__(self, key):
|
||||
try:
|
||||
self[key]
|
||||
except KeyError:
|
||||
return False
|
||||
else:
|
||||
return True
|
||||
|
||||
def iterkeys(self):
|
||||
return iter(self)
|
||||
|
||||
def itervalues(self):
|
||||
for key in self:
|
||||
yield self[key]
|
||||
|
||||
def iteritems(self):
|
||||
for key in self:
|
||||
yield (key, self[key])
|
||||
|
||||
def keys(self):
|
||||
return list(self)
|
||||
|
||||
def items(self):
|
||||
return [(key, self[key]) for key in self]
|
||||
|
||||
def values(self):
|
||||
return [self[key] for key in self]
|
||||
|
||||
# Mappings are not hashable by default, but subclasses can change this
|
||||
__hash__ = None
|
||||
|
||||
def __eq__(self, other):
|
||||
if not isinstance(other, Mapping):
|
||||
return NotImplemented
|
||||
return dict(self.items()) == dict(other.items())
|
||||
|
||||
def __ne__(self, other):
|
||||
return not (self == other)
|
||||
|
||||
class MappingView(Sized):
|
||||
|
||||
def __init__(self, mapping):
|
||||
self._mapping = mapping
|
||||
|
||||
def __len__(self):
|
||||
return len(self._mapping)
|
||||
|
||||
def __repr__(self):
|
||||
return '{0.__class__.__name__}({0._mapping!r})'.format(self)
|
||||
|
||||
|
||||
class KeysView(MappingView, Set):
|
||||
|
||||
@classmethod
|
||||
def _from_iterable(self, it):
|
||||
return set(it)
|
||||
|
||||
def __contains__(self, key):
|
||||
return key in self._mapping
|
||||
|
||||
def __iter__(self):
|
||||
for key in self._mapping:
|
||||
yield key
|
||||
|
||||
|
||||
class ItemsView(MappingView, Set):
|
||||
|
||||
@classmethod
|
||||
def _from_iterable(self, it):
|
||||
return set(it)
|
||||
|
||||
def __contains__(self, item):
|
||||
key, value = item
|
||||
try:
|
||||
v = self._mapping[key]
|
||||
except KeyError:
|
||||
return False
|
||||
else:
|
||||
return v == value
|
||||
|
||||
def __iter__(self):
|
||||
for key in self._mapping:
|
||||
yield (key, self._mapping[key])
|
||||
|
||||
|
||||
class ValuesView(MappingView):
|
||||
|
||||
def __contains__(self, value):
|
||||
for key in self._mapping:
|
||||
if value == self._mapping[key]:
|
||||
return True
|
||||
return False
|
||||
|
||||
def __iter__(self):
|
||||
for key in self._mapping:
|
||||
yield self._mapping[key]
|
||||
|
||||
|
||||
class MutableMapping(Mapping):
|
||||
|
||||
@abstractmethod
|
||||
def __setitem__(self, key, value):
|
||||
raise KeyError
|
||||
|
||||
@abstractmethod
|
||||
def __delitem__(self, key):
|
||||
raise KeyError
|
||||
|
||||
__marker = object()
|
||||
|
||||
def pop(self, key, default=__marker):
|
||||
try:
|
||||
value = self[key]
|
||||
except KeyError:
|
||||
if default is self.__marker:
|
||||
raise
|
||||
return default
|
||||
else:
|
||||
del self[key]
|
||||
return value
|
||||
|
||||
def popitem(self):
|
||||
try:
|
||||
key = next(iter(self))
|
||||
except StopIteration:
|
||||
raise KeyError
|
||||
value = self[key]
|
||||
del self[key]
|
||||
return key, value
|
||||
|
||||
def clear(self):
|
||||
try:
|
||||
while True:
|
||||
self.popitem()
|
||||
except KeyError:
|
||||
pass
|
||||
|
||||
def update(*args, **kwds):
|
||||
if len(args) > 2:
|
||||
raise TypeError("update() takes at most 2 positional "
|
||||
"arguments ({} given)".format(len(args)))
|
||||
elif not args:
|
||||
raise TypeError("update() takes at least 1 argument (0 given)")
|
||||
self = args[0]
|
||||
other = args[1] if len(args) >= 2 else ()
|
||||
|
||||
if isinstance(other, Mapping):
|
||||
for key in other:
|
||||
self[key] = other[key]
|
||||
elif hasattr(other, "keys"):
|
||||
for key in other.keys():
|
||||
self[key] = other[key]
|
||||
else:
|
||||
for key, value in other:
|
||||
self[key] = value
|
||||
for key, value in kwds.items():
|
||||
self[key] = value
|
||||
|
||||
def setdefault(self, key, default=None):
|
||||
try:
|
||||
return self[key]
|
||||
except KeyError:
|
||||
self[key] = default
|
||||
return default
|
||||
|
||||
MutableMapping.register(dict)
|
||||
|
||||
|
||||
### SEQUENCES ###
|
||||
|
||||
|
||||
class Sequence(Sized, Iterable, Container):
|
||||
"""All the operations on a read-only sequence.
|
||||
|
||||
Concrete subclasses must override __new__ or __init__,
|
||||
__getitem__, and __len__.
|
||||
"""
|
||||
|
||||
@abstractmethod
|
||||
def __getitem__(self, index):
|
||||
raise IndexError
|
||||
|
||||
def __iter__(self):
|
||||
i = 0
|
||||
try:
|
||||
while True:
|
||||
v = self[i]
|
||||
yield v
|
||||
i += 1
|
||||
except IndexError:
|
||||
return
|
||||
|
||||
def __contains__(self, value):
|
||||
for v in self:
|
||||
if v == value:
|
||||
return True
|
||||
return False
|
||||
|
||||
def __reversed__(self):
|
||||
for i in reversed(range(len(self))):
|
||||
yield self[i]
|
||||
|
||||
def index(self, value):
|
||||
for i, v in enumerate(self):
|
||||
if v == value:
|
||||
return i
|
||||
raise ValueError
|
||||
|
||||
def count(self, value):
|
||||
return sum(1 for v in self if v == value)
|
||||
|
||||
Sequence.register(tuple)
|
||||
Sequence.register(basestring)
|
||||
Sequence.register(buffer)
|
||||
Sequence.register(xrange)
|
||||
|
||||
|
||||
class MutableSequence(Sequence):
|
||||
|
||||
@abstractmethod
|
||||
def __setitem__(self, index, value):
|
||||
raise IndexError
|
||||
|
||||
@abstractmethod
|
||||
def __delitem__(self, index):
|
||||
raise IndexError
|
||||
|
||||
@abstractmethod
|
||||
def insert(self, index, value):
|
||||
raise IndexError
|
||||
|
||||
def append(self, value):
|
||||
self.insert(len(self), value)
|
||||
|
||||
def reverse(self):
|
||||
n = len(self)
|
||||
for i in range(n//2):
|
||||
self[i], self[n-i-1] = self[n-i-1], self[i]
|
||||
|
||||
def extend(self, values):
|
||||
for v in values:
|
||||
self.append(v)
|
||||
|
||||
def pop(self, index=-1):
|
||||
v = self[index]
|
||||
del self[index]
|
||||
return v
|
||||
|
||||
def remove(self, value):
|
||||
del self[self.index(value)]
|
||||
|
||||
def __iadd__(self, values):
|
||||
self.extend(values)
|
||||
return self
|
||||
|
||||
MutableSequence.register(list)
|
||||
|
||||
Reference in New Issue
Block a user