Re: isPrime works but UnBoundLocalError when mapping on list

[Fredrik Lundh]

Andreas Tawn wrote:

I never knew that and I can't find reference to it in the docs.

the for-in loop does ordinary assignments in the current scope:

http://docs.python.org/ref/for.html

"Each item in turn is assigned to the target list using the
standard rules for assignments, and then the suite is executed."

somewhat simplified, "for vars in expression: code" is equivalent to
inlining:

_ = iter(expression )
while 1:
try:
vars = _.next()
except StopIteration:
break
else:
body

where "_" is an internal variable.

</F>