Nobody writes: > On Thu, 21 Mar 2013 01:52:17 -0700, bartolome.sintes wrote: > > > In Python 3, "free variable" and "nonlocal variable" are synonym > > terms? > > "Free variable" is a computer science term. A variable is free if it > is not bound. E.g. x and y are free in "x+y", x is bound and y is > free in "lambda x: x+y", x and y are both bound in "lambda y: lambda > x: x+y". IOW, a variable is free in an expression if the expression > doesn't include whatever created the variable.
And in (lambda x : x)(x) + x below, x occurs both free and bound. The free occurrences are bound by the outer lambda. >>> (lambda x : (lambda x : x)(x) + x)(3) 6 -- http://mail.python.org/mailman/listinfo/python-list