New submission from Hrvoje Nikšić <[email protected]>:
I find that I frequently need the "null" (no-op) context manager. For example,
in code such as:
with transaction or contextlib.null():
...
Since there is no easy expression to create a null context manager, we must
resort to workarounds, such as:
if transaction:
with transaction:
... code ...
else:
... duplicated code ...
(with the usual options of moving the duplicated code to a function—but still.)
Or by creating ad-hoc null context managers with the help of
contextlib.contextmanager:
if transaction is None:
transaction = contextlib.contextmanager(lambda: iter([None])()
with transaction:
...
Adding a "null" context manager would be both practical and elegant. I have
attached a patch for contextlib.py
----------
files: fl
messages: 118181
nosy: hniksic
priority: normal
severity: normal
status: open
title: Add the null context manager to contextlib
Added file: http://bugs.python.org/file19158/fl
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<http://bugs.python.org/issue10049>
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