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Description:
An unexpected UnboundLocalError is produced when assigning a value to a variable inside a nested function. The first assignment to the variable is in the enclosing function.
Example:
def x():
 a = False
 def y():
 print a
 a = True
 return y
Calling x()() produces an UnboundLocalError on the 'print a' line.
If the 'a = True' line is removed, no error occurs.
Tested with:
 - 2.5.1
 - 2.6.5
Keywords: 
Nested function, UnboundLocalError, variable assignment
Thank you for your attention