2009/12/4 Петров Александр <gmdi...@gmail.com>: > Hello All ! > > In my code I try to use a generic approach to work with tuples. Let > "X" be a tuple. > When I want to access a first element of a tuple, I can write: "X[0]". > And that is really working when X is a n-arity tuple, with n>1 (for > example "foo( (1,2,3) )" ). > But when I call my library function with a 1-arity tuple (for example > "foo( (1) )" ) I have an error: > > TypeError: 'int' object is unsubscriptable > > How could I tell Python that "(1)" is not an integer, but an one-arity tuple ?
Tuples in Python are recognized/defined not by the brackets, but by the commas; the brackets just function to specify the exact beginning and ending of the tuple in cases where that is not directly clear. "(1,2,3)" is a tuple, but "1,2,3" is also the same tuple. A 1-tuple can be created as "1," or "(1,)". -- André Engels, andreeng...@gmail.com -- http://mail.python.org/mailman/listinfo/python-list
