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Conditionally enter a context manager

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conditional(condition, contextmanager)
Enter contextmanager only if condition is true.

Overview

The conditional context manager comes handy when you always want to execute a with-block but only conditionally want to apply its context manager.

If you find yourself writing code like this:

if CONDITION:
    with CONTEXTMANAGER():
        BODY()
else:
    BODY()

Consider replacing it with:

with conditional(CONDITION, CONTEXTMANAGER()):
    BODY()

Examples

Say we want to ignore signals when a pager application is in the foreground, but not otherwise:

from conditional import conditional

with conditional(has_pager(cmd), ignoresignals()):
    os.system(cmd)

Changelog

1.2 - 2017-02-05

  • Support Python 2.6-3.6 without 2to3. [stefan]
  • Add a LICENSE file. [stefan]

1.1 - 2014-04-19

  • Remove setuptools from install_requires because it isn’t. [stefan]

1.0 - 2012-05-16

  • Initial release. [stefan]

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