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    <p>Since Python is an interpreted language, it can't jump around in its own code. But you don't need a "special tool" to strip off parts of your code -- use Python for it!</p> <p>Here is a minimal example. You'll probably want to put the <code>strip_debug()</code> function in your <code>__init__.py</code> and let it process a list of modules. Also, you'd probably want to add some additional check that the user really wants to <em>modify</em> the code, not just <em>run</em> it. Probably, using a command line option like <code>--purge</code> would be nice. You can then either make a copy of your library and once run</p> <pre><code>python __init__.py --purge </code></pre> <p>before you publish the library or leave it up to your users to do so.</p> <pre><code>#!/usr/bin/env python3.2 # BEGIN DEBUG def _strip_debug(): """ Generates an optimized version of its own code stripping off all debugging code. """ import os import re import shutil import sys import tempfile begin_debug = re.compile("^\s*#+\s*BEGIN\s+DEBUG\s*$") end_debug = re.compile("^\s*#+\s*END\s+DEBUG\s*$") tmp = None debug = False try: tmp = tempfile.NamedTemporaryFile(mode="w", suffix=".py", delete=False) with open(sys.argv[0]) as my_code: for line in my_code: if begin_debug.match(line): debug = True continue elif end_debug.match(line): debug = False continue else: if not debug: tmp.write(line) tmp.close() shutil.copy(tmp.name, sys.argv[0]) finally: os.unlink(tmp.name) # END DEBUG def foo(bar, baz): """ Do something weired with bar and baz. """ # BEGIN DEBUG if DEBUG: print("bar = {}".format(bar)) print("baz = {}".format(baz)) # END DEBUG return bar + baz # BEGIN DEBUG if __name__ == "__main__": _strip_debug() # END DEBUG </code></pre> <p>After executed, this file will only contain the functional code of the <code>foo()</code> function. I have used the special comments</p> <pre><code># BEGIN DEBUG </code></pre> <p>and</p> <pre><code># END DEBUG </code></pre> <p>in this example which allows to strip off arbitrary code but if it's just for removing</p> <pre><code>if DEBUG: # stuff </code></pre> <p>sections, it would also be pretty easy to detect those without any additional comments.</p>
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    1. POHow to prevent a part of arbitrary code to be compiled in Python?
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    1. POHow to prevent a part of arbitrary code to be compiled in Python?
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    1. COThank you, this is an interesting technique. I was thinking to make user decide if he wants this debug code or not by `-O` flag, like with asserts.
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    2. COAddendum: Would of course be more useful to have in the `setup.py` not in the `__init__.py` file so the user can decide during install whether to pass the option.
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