The Python Apprentice

Not using range: enumerate()

At this point we're going to show you another example of poorly styled code, except this time it's one you can, and should, avoid. Here's a poor way to print the elements in a list:

>>> s = [0, 1, 4, 6, 13]>>> for i in range(len(s)):...     print(s[i])...014613

Although this works, it is most definitely unPythonic. Always prefer to use iteration over objects themselves:

>>> s = [0, 1, 4, 6, 13]>>> for v in s:...     print(v)014613

If you need a counter, you should use the built-in enumerate() function which returns an iterable series of pairs, each pair being a tuple. The first element of each pair is the index of the current item and the second element of each pair is the item itself:

>>> t = [6, 372, 8862, 148800, 2096886] ...