[EMAIL PROTECTED] said unto the world upon 2005-05-07 09:56: > Good morning, > > I came across a rather odd issue with scoping. Can someone explain why > testa and testc works, but not testb. I am running under python 2.4.1 on > Windows NT. > > thanks, > Michael
<SNIP> > def testb(astr): > x = x - 1 > print astr, x `x =', with a function def, gets interpreted as "create a new name x in the function-local scope and bind it to whatever is on the right of the `='. But, on the right is an expression involving x itself. You might expect Python to look to the global scope to find x, but by writing `x =', you've already settled that x will be a local scope name, so it looks only in the local scope. Of, course, when it gets to `x -1', x hasn't yet been given a reference and it all barfs. HTH, Brian vdB _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
