'int' object is not callable

[Erik Max Francis]

JW wrote:

> If i remove line 1, then my foo() method does print out correct value
> for aTuple[0].
> 
> Why am I getting this error when i try using python len() built-in
> function?

Probably because somewhere along the line someone's replacement the
`len' builtin with a variable containing an int object.

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