env is written

env.py

@@ -0,0 +1,52 @@
+# -*- coding: utf-8 -*-
+
+from os import environ
+
+def lower_dict(d):
+    """Lower cases string keys in given dict."""
+
+    _d = {}
+
+    for k, v in d.iteritems():
+        try:
+            _d[k.lower()] = v
+        except AttributeError:
+            _d[k] = v
+
+    return _d
+
+
+def prefix(prefix):
+    """Returns a dictionary of all environment variables starting with
+    the given prefix, lower cased and stripped.
+    """
+
+    d = {}
+    e = lower_dict(environ.copy())
+
+    prefix = prefix.lower()
+
+    for k, v in e.iteritems():
+        try:
+            if k.startswith(prefix):
+                k = k[len(prefix):]
+                d[k] = v
+        except AttributeError:
+            print k
+            pass
+
+    return d
+
+
+def map(**kwargs):
+    """Returns a dictionary of the given keyword arguments mapped to their
+    values from the environment.
+    """
+
+    d = {}
+    e = lower_dict(environ.copy())
+
+    for k, v in kwargs.iteritems():
+        d[k] = e.get(v)
+
+    return d