Incorrect 'undefined name' in presence of conditional del statement

[Steve Leonard]

Reproducible with this code:
# example.py
x = 7
if False:
    del x
else:
    print x

$>pyflakes example.py
example.py:5: undefined name 'x'
# This corresponds to the line 'print x'

$>pyflakes --version
0.7.3

[Florent (florent.x)]

Thank you for the report.
This case is not easy to support with Pyflakes.

The workaround is to refactor the source code which gives a false positive.