wyz23x2 <wyz2...@163.com> added the comment:

You could add a check that does this:
(a)
from tempfile import mktemp
with open(mktemp()) as f:
    # do something...

## No Warnings
(b)
from tempfile import mktemp
path = mktemp()
# do something...
with open(mktemp()) as f:
    # do something...

## RuntimeWarning: mktemp() is unsafe. Use NamedTemporaryFile(delete=False).

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39768>
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