[Python-projects] pylint: Avoidable W0631

[Jürgen Hermann]

The following can be detected since the loop variable is assigned to in the else clause (since either the loop target list gets assigned to, OR the else clause runs).

> cat lint2.py
"Avoidable W0631"
for defined in range(0):
    pass
else:
    defined = -1

print defined

> pylint -rn -iy lint2.py
************* Module lint2
W0631:  7: Using possibly undefined loop variable 'defined'

> python lint2.py
-1