STINNER Victor <[email protected]> added the comment:
The following command still fails on the Python main branch on Linux:
---
$ env -i =value ./python -c 'import pprint, os; pprint.pprint(os.environ); del
os.environ[""]'
environ({'': 'value', 'LC_CTYPE': 'C.UTF-8'})
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/home/vstinner/python/main/Lib/os.py", line 689, in __delitem__
unsetenv(encodedkey)
^^^^^^^^^^^^^^^^^^^^
OSError: [Errno 22] Invalid argument
---
'del os.environ[""]' calls unsetenv("") which fails with EINVAL.
Python is a thin wrapper to C functions setenv() and unsetenv(), and raises an
exception when a C function fails. It works as expected.
Python exposes the variable with an empty name which is found in the
environment variables: again, it works as expected.
I don't see how Python could do better, since the glibc unsetenv() fails with
EINVAL if the string is empty. It is even a documented behaviour, see the
unsetenv() manual page:
---
ERRORS
EINVAL name is NULL, points to a string of length 0, or contains an '='
character.
---
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<https://bugs.python.org/issue20658>
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