Generating an ascending list of numbers of arbitrary length in python

range(10) is built in.

If you want an iterator that gives you a series of indeterminate length, there is itertools.count(). Here I am iterating with range() so there is a limit to the loop.

>>> import itertools
>>> for x, y in zip(range(10), itertools.count()):
...     print x, y
... 
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9

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Later: also, range() returns an iterator, not a list, in python 3.x. in that case, you want list(range(10)).

You want range().