[New-bugs-announce] [issue13585] Add contextlib.CleanupManager

[Nikolaus Rath]

New submission from Nikolaus Rath <Nikolaus at rath.org>:

I'd like to propose addding the CleanupManager class described in http://article.gmane.org/gmane.comp.python.ideas/12447 to the contextlib module. The idea is to add a general-purpose context manager to manage (python or non-python) resources that don't come with their own context manager.

Example code:

with CleanupManager() als mngr:
    tmpdir = tempfile.mkdtemp()
    mngr.register(shutil.rmtree(tmpdir))
    # do stuff with tmpdir

# shutil.rmtree() get's called automatically when the block is over

Note that mkdtemp() could of course also be changed to become its own context manager. The idea is to provide a general facility for this kind of problem, so it doesn't have to be reinvented whenever a module provides a ressource without its own context manager. Other possible uses are of course ressources that are completely external to Python,
e.g. anything allocated with a subprocess (think of subprocess.check_call('mount'))/


I'll be happy to make a proper patch with documentation and testcases from Jan's code. As a matter of fact, I'll probably start working out it right now, so please let me know quickly if this doesn't have a chance of getting accepted.

----------
components: Library (Lib)
messages: 149268
nosy: Nikratio
priority: normal
severity: normal
status: open
title: Add contextlib.CleanupManager
type: feature request
versions: Python 3.3, Python 3.4

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<http://bugs.python.org/issue13585>
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