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Showing content from http://mail.python.org/pipermail/python-dev/2002-August/028357.html below:

[Python-Dev] A `cogen' module - an observation

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[f(x, y) for x in X for y in Y] 

  is equivalent to:

[f(x, y) for x, y in cartesian(X, Y)] 

I never found any real use for list comprehensions with more than one 
dimension. When I use nested loops they are usually for something that 
cannot be expressed as a list comprehension.

	Oren

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