Why am I getting a TypeError when looping?

Posted by Lee Crabtree on Stack Overflow See other posts from Stack Overflow or by Lee Crabtree
Published on 2010-04-21T18:31:00Z Indexed on 2010/04/21 18:33 UTC
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I'm working on a Python extension module, and one of my little test scripts is doing something strange, viz.:

x_max, y_max, z_max = m.size

for x in xrange(x_max):
    for y in xrange(y_max):
        for z in xrange(z_max):
            #do my stuff

What makes no sense is that the loop gets to the end of the first 'z' iteration, then throws a TypeError, stating that "an integer is required". If I put a try...except TypeError around it and check the types of x, y, and z, they all come back as < type 'int' >.

Am I missing something here?

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