[New-bugs-announce] [issue13827] Unexecuted import changes namespace

[Michael Hipp]

New submission from Michael Hipp <michael at redmule.com>:

A local *unexecuted* import appears to be changing the namespace. Attached files are ready to run.

# over.py
SOMETHING = "overridden"

# main.py
OVERRIDE = False
SOMETHING = "original"

def main():
    #global SOMETHING  # uncomment and it works
    if OVERRIDE:
        from over import SOMETHING  # comment out and it works
        pass
    print SOMETHING  # UnboundLocalError: local variable 'SOMETHING' referenced before assignment

The SOMETHING variable has a value from the module global namespace, but it gets lost due to an import that is never executed.

I would think an unexecuted statement shouldn't have any effect on anything.

The second file will have to be submitted in a follow-on, it appears

----------
components: None
files: main.py
messages: 151635
nosy: hippmr
priority: normal
severity: normal
status: open
title: Unexecuted import changes namespace
type: behavior
versions: Python 2.7
Added file: http://bugs.python.org/file24278/main.py

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13827>
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