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You are here: Home / What is the difference between range and xrange functions in Python 2.X?

What is the difference between range and xrange functions in Python 2.X?

October 8, 2021 by James Palmer

In Python 2.x:

range creates a list, so if you do range(1, 10000000) it creates a list in memory with 9999999 elements.

xrange is a sequence object that evaluates lazily.

In Python 3:

range does the equivalent of Python 2’s xrange. To get the list, you have to explicitly use list(range(…)).
xrange no longer exists.

range creates a list, so if you do range(1, 10000000) it creates a list in memory with 9999999 elements.
xrange is a generator, so it is a sequence object is a that evaluates lazily.

This is true, but in Python 3, range() will be implemented by the Python 2 xrange(). If you need to actually generate the list, you will need to do:
list(range(1,100))

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