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synced 2026-06-05 23:40:18 +00:00
doing it
This commit is contained in:
Kenneth Reitz
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@@ -6,6 +6,6 @@
|
||||
Welcome to OSXPython.org
|
||||
=====================================
|
||||
|
||||
Welcome to OSXPython.org. This site exists to provide novice and expert Python developers using OS X a best-practice handbook to the installation, configuration, and usage of Python on a daily basis.
|
||||
Welcome to OSXPython.org. This site exists to provide both novice and expert Python developers using OS X a best-practice handbook to the installation, configuration, and usage of Python on a daily basis.
|
||||
|
||||
.. include:: contents.rst.inc
|
||||
+25
-2
@@ -22,6 +22,7 @@
|
||||
<script type="text/javascript" src="_static/underscore.js"></script>
|
||||
<script type="text/javascript" src="_static/doctools.js"></script>
|
||||
<link rel="top" title="osxpython v0.0.1 documentation" href="#" />
|
||||
<link rel="next" title="Properly Installing Python" href="installation.html" />
|
||||
|
||||
|
||||
<link media="only screen and (max-device-width: 480px)" href="_static/small_flask.css" type= "text/css" rel="stylesheet" />
|
||||
@@ -34,6 +35,9 @@
|
||||
<li class="right" style="margin-right: 10px">
|
||||
<a href="genindex.html" title="General Index"
|
||||
accesskey="I">index</a></li>
|
||||
<li class="right" >
|
||||
<a href="installation.html" title="Properly Installing Python"
|
||||
accesskey="N">next</a> |</li>
|
||||
<li><a href="#">osxpython v0.0.1 documentation</a> »</li>
|
||||
</ul>
|
||||
</div>
|
||||
@@ -45,14 +49,32 @@
|
||||
|
||||
<div class="section" id="welcome-to-osxpython-org">
|
||||
<h1>Welcome to OSXPython.org<a class="headerlink" href="#welcome-to-osxpython-org" title="Permalink to this headline">¶</a></h1>
|
||||
<p>Welcome to OSXPython.org. This site exists to provide novice and expert Python developers using OS X a best-practice handbook to the installation, configuration, and usage of Python on a daily basis.</p>
|
||||
<p>Welcome to OSXPython.org. This site exists to provide both novice and expert Python developers using OS X a best-practice handbook to the installation, configuration, and usage of Python on a daily basis.</p>
|
||||
<div class="section" id="user-s-guide">
|
||||
<h2>User’s Guide<a class="headerlink" href="#user-s-guide" title="Permalink to this headline">¶</a></h2>
|
||||
<p>This part of the documentation, which is mostly prose, begins with some
|
||||
background information about Flask, then focuses on step-by-step
|
||||
instructions for web development with Flask.</p>
|
||||
<div class="toctree-wrapper compound">
|
||||
<ul class="simple">
|
||||
<ul>
|
||||
<li class="toctree-l1"><a class="reference internal" href="installation.html">Properly Installing Python</a><ul>
|
||||
<li class="toctree-l2"><a class="reference internal" href="installation.html#package-manager">Package Manager</a></li>
|
||||
<li class="toctree-l2"><a class="reference internal" href="installation.html#python-interpreter">Python Interpreter</a></li>
|
||||
<li class="toctree-l2"><a class="reference internal" href="installation.html#distribute-pip">Distribute & Pip</a></li>
|
||||
<li class="toctree-l2"><a class="reference internal" href="installation.html#further-improving-the-shell-experience">Further Improving the Shell Experience</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
<li class="toctree-l1"><a class="reference internal" href="useful-tools.html">Useful Tools</a><ul>
|
||||
<li class="toctree-l2"><a class="reference internal" href="useful-tools.html#ipython">IPython</a></li>
|
||||
<li class="toctree-l2"><a class="reference internal" href="useful-tools.html#bpython">BPython</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
<li class="toctree-l1"><a class="reference internal" href="shell.html">Working with the Shell</a><ul>
|
||||
<li class="toctree-l2"><a class="reference internal" href="shell.html#diving-into-context-locals">Diving into Context Locals</a></li>
|
||||
<li class="toctree-l2"><a class="reference internal" href="shell.html#firing-before-after-request">Firing Before/After Request</a></li>
|
||||
<li class="toctree-l2"><a class="reference internal" href="shell.html#further-improving-the-shell-experience">Further Improving the Shell Experience</a></li>
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
</div>
|
||||
</div>
|
||||
@@ -99,6 +121,7 @@ method, this part of the documentation is for you.</p>
|
||||
<h3>Related Topics</h3>
|
||||
<ul>
|
||||
<li><a href="#">Documentation overview</a><ul>
|
||||
<li>Next: <a href="installation.html" title="next chapter">Properly Installing Python</a></li>
|
||||
</ul></li>
|
||||
</ul>
|
||||
<h3>This Page</h3>
|
||||
|
||||
@@ -1 +1 @@
|
||||
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|
||||
+1
-1
@@ -11,7 +11,7 @@ instructions for web development with Flask.
|
||||
|
||||
foreword
|
||||
installation
|
||||
quickstart
|
||||
useful-tools
|
||||
tutorial/index
|
||||
templating
|
||||
testing
|
||||
|
||||
@@ -6,6 +6,6 @@
|
||||
Welcome to OSXPython.org
|
||||
=====================================
|
||||
|
||||
Welcome to OSXPython.org. This site exists to provide novice and expert Python developers using OS X a best-practice handbook to the installation, configuration, and usage of Python on a daily basis.
|
||||
Welcome to OSXPython.org. This site exists to provide both novice and expert Python developers using OS X a best-practice handbook to the installation, configuration, and usage of Python on a daily basis.
|
||||
|
||||
.. include:: contents.rst.inc
|
||||
+74
-83
@@ -1,107 +1,98 @@
|
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Working with the Shell
|
||||
======================
|
||||
Properly Installing Python
|
||||
==========================
|
||||
|
||||
.. versionadded:: 0.3
|
||||
*Or, "Installing Python 2.7 via Homebrew".*
|
||||
|
||||
One of the reasons everybody loves Python is the interactive shell. It
|
||||
basically allows you to execute Python commands in real time and
|
||||
immediately get results back. Flask itself does not come with an
|
||||
interactive shell, because it does not require any specific setup upfront,
|
||||
just import your application and start playing around. ::
|
||||
just import your application and start playing around.
|
||||
|
||||
|
||||
|
||||
|
||||
Package Manager
|
||||
---------------
|
||||
|
||||
While Snow Leopard comes with a large number of UNIX utilities, those
|
||||
familiar with Linux systems will notice one key component missing: a
|
||||
package manager. Mxcl's *Homebrew* is the answer.
|
||||
|
||||
To install Homebrew, simply run: ::
|
||||
|
||||
$ ruby -e "$(curl -fsS http://gist.github.com/raw/323731/install_homebrew.rb)"
|
||||
|
||||
And we can now install python: ::
|
||||
|
||||
It's basic commands are **update**, **install**, and **remove**.
|
||||
|
||||
.. man brew
|
||||
|
||||
|
||||
|
||||
Python Interpreter
|
||||
------------------
|
||||
|
||||
And we can now install Python 2.7: ::
|
||||
|
||||
$ sudo brew install python --framework
|
||||
|
||||
|
||||
There are however some handy helpers to make playing around in the shell a
|
||||
more pleasant experience. The main issue with interactive console
|
||||
sessions is that you're not triggering a request like a browser does which
|
||||
means that :data:`~flask.g`, :data:`~flask.request` and others are not
|
||||
available. But the code you want to test might depend on them, so what
|
||||
can you do?
|
||||
|
||||
This is where some helper functions come in handy. Keep in mind however
|
||||
that these functions are not only there for interactive shell usage, but
|
||||
also for unittesting and other situations that require a faked request
|
||||
context.
|
||||
|
||||
Diving into Context Locals
|
||||
--------------------------
|
||||
|
||||
Say you have a utility function that returns the URL the user should be
|
||||
redirected to. Imagine it would always redirect to the URL's ``next``
|
||||
parameter or the HTTP referrer or the index page::
|
||||
|
||||
from flask import request, url_for
|
||||
|
||||
def redirect_url():
|
||||
return request.args.get('next') or \
|
||||
request.referrer or \
|
||||
url_for('index')
|
||||
|
||||
As you can see, it accesses the request object. If you try to run this
|
||||
from a plain Python shell, this is the exception you will see:
|
||||
|
||||
>>> redirect_url()
|
||||
Traceback (most recent call last):
|
||||
File "<stdin>", line 1, in <module>
|
||||
AttributeError: 'NoneType' object has no attribute 'request'
|
||||
|
||||
That makes a lot of sense because we currently do not have a request we
|
||||
could access. So we have to make a request and bind it to the current
|
||||
context. The :attr:`~flask.Flask.test_request_context` method can create
|
||||
us a request context:
|
||||
|
||||
>>> ctx = app.test_request_context('/?next=http://example.com/')
|
||||
|
||||
This context can be used in two ways. Either with the `with` statement
|
||||
(which unfortunately is not very handy for shell sessions). The
|
||||
alternative way is to call the `push` and `pop` methods:
|
||||
|
||||
>>> ctx.push()
|
||||
|
||||
From that point onwards you can work with the request object:
|
||||
|
||||
>>> redirect_url()
|
||||
u'http://example.com/'
|
||||
|
||||
Until you call `pop`:
|
||||
|
||||
>>> ctx.pop()
|
||||
>>> redirect_url()
|
||||
Traceback (most recent call last):
|
||||
File "<stdin>", line 1, in <module>
|
||||
AttributeError: 'NoneType' object has no attribute 'request'
|
||||
The ``--framework`` option tells Homebrew to compile Python in Framework
|
||||
mode. The outdated version of Python that Snow Leopard comes packaged with
|
||||
is built as a Framework, so this helps avoid some future module installation
|
||||
bugs.
|
||||
|
||||
|
||||
Firing Before/After Request
|
||||
---------------------------
|
||||
Distribute & Pip
|
||||
----------------
|
||||
|
||||
By just creating a request context, you still don't have run the code that
|
||||
is normally run before a request. This probably results in your database
|
||||
being unavailable, the current user not being stored on the
|
||||
:data:`~flask.g` object etc.
|
||||
*Distribute* is a fantastic drop-in replacement for *easy_install* and
|
||||
*setuptools*. It allows you to install and manage python packages from
|
||||
pypi.python.org, amongst a few other sources. It also plays well with
|
||||
*virtualenv* and user-enviornments.
|
||||
|
||||
This however can easily be done yourself. Just call
|
||||
:meth:`~flask.Flask.preprocess_request`:
|
||||
To install *Distribute* and it's *easy_install* run the following commands: ::
|
||||
|
||||
>>> ctx = app.test_request_context()
|
||||
>>> ctx.push()
|
||||
>>> app.preprocess_request()
|
||||
$ curl -O http://python-distribute.org/distribute_setup.py
|
||||
$ python distribute_setup.py
|
||||
|
||||
Keep in mind that the :meth:`~flask.Flask.preprocess_request` function
|
||||
might return a response object, in that case just ignore it.
|
||||
**easy_install** is considered by many to be a deprecated system, so we will
|
||||
install it's replacement: **pip**. Pip allows for uninstallation of packages,
|
||||
and is actively maintained, unlike setuptool's easy_install.
|
||||
|
||||
To shutdown a request, you need to trick a bit before the after request
|
||||
functions (triggered by :meth:`~flask.Flask.process_response`) operate on
|
||||
a response object:
|
||||
To install ``pip``: ::
|
||||
|
||||
>>> app.process_response(app.response_class())
|
||||
<Response 0 bytes [200 OK]>
|
||||
>>> ctx.pop()
|
||||
$ easy_install pip
|
||||
|
||||
Hopefully you'll never have to use **easy_install** again.
|
||||
|
||||
|
||||
.. Firing Before/After Request
|
||||
.. ---------------------------
|
||||
..
|
||||
.. By just creating a request context, you still don't have run the code that
|
||||
.. is normally run before a request. This probably results in your database
|
||||
.. being unavailable, the current user not being stored on the
|
||||
.. :data:`~flask.g` object etc.
|
||||
..
|
||||
.. This however can easily be done yourself. Just call
|
||||
.. :meth:`~flask.Flask.preprocess_request`:
|
||||
..
|
||||
.. >>> ctx = app.test_request_context()
|
||||
.. >>> ctx.push()
|
||||
.. >>> app.preprocess_request()
|
||||
..
|
||||
.. Keep in mind that the :meth:`~flask.Flask.preprocess_request` function
|
||||
.. might return a response object, in that case just ignore it.
|
||||
..
|
||||
.. To shutdown a request, you need to trick a bit before the after request
|
||||
.. functions (triggered by :meth:`~flask.Flask.process_response`) operate on
|
||||
.. a response object:
|
||||
..
|
||||
.. >>> app.process_response(app.response_class())
|
||||
.. <Response 0 bytes [200 OK]>
|
||||
.. >>> ctx.pop()
|
||||
|
||||
|
||||
Further Improving the Shell Experience
|
||||
|
||||
@@ -0,0 +1,48 @@
|
||||
Useful Tools
|
||||
=================
|
||||
|
||||
*For Python 2.7.*
|
||||
|
||||
One of the reasons everybody loves Python is the interactive shell. It
|
||||
basically allows you to execute Python commands in real time and
|
||||
immediately get results back. Flask itself does not come with an
|
||||
interactive shell, because it does not require any specific setup upfront,
|
||||
just import your application and start playing around. ::
|
||||
|
||||
$ pip install bpython
|
||||
|
||||
And we can now install Python 2.7: ::
|
||||
|
||||
$
|
||||
|
||||
|
||||
The **--framework** option tells Python
|
||||
|
||||
IPython
|
||||
-------------------------------
|
||||
|
||||
Say you have a utility function that returns the URL the user should be
|
||||
redirected to. Imagine it would always redirect to the URL's ``next``
|
||||
parameter or the HTTP referrer or the index page::
|
||||
|
||||
$ curl -O http://python-distribute.org/distribute_setup.py
|
||||
$ python distribute_setup.py
|
||||
|
||||
As you can see, it accesses the request object. If you try to run this
|
||||
from a plain Python shell, this is the exception you will see: ::
|
||||
|
||||
$ easy_install pip
|
||||
|
||||
Hopefully you'll never have to use **easy_install** again.
|
||||
|
||||
|
||||
|
||||
|
||||
BPython
|
||||
-------
|
||||
|
||||
By just creating a request context, you still don't have run the code that
|
||||
is normally run before a request. This probably results in your database
|
||||
being unavailable, the current user not being stored on the
|
||||
:data:`~flask.g` object etc.
|
||||
|
||||
Reference in New Issue
Block a user