[issue30306] release arguments of contextmanager

[Martin Teichmann]

New submission from Martin Teichmann:

The arguments of a function which was decorated to be a context manager are stored inside the context manager, and are thus kept alive.

This is a memory leak.

Example:

    @contextmanager
    def f(a):
        do_something_with(a)
        a = None  # should release the memory
        yield

if this is now called with something big, say

    with f(something_really_huge):
        pass

then this something_really_huge is kept alive during the with statement, even though the function explicitly let go of it.

----------
components: Library (Lib)
messages: 293234
nosy: Martin.Teichmann
priority: normal
severity: normal
status: open
title: release arguments of contextmanager
type: resource usage
versions: Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30306>
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