The primary aim of the for statement is to traverse a list, that is, to apply the same sequence of commands to each element of a given list:
for s in ['a', 'b', 'c']:
print(s) # a b c
In this example, the loop variable, s, is successively assigned to one element of the list. Notice that the loop variable is available after the loop has terminated. This may sometimes be useful; see, for instance, the example in Section 9.2: Controlling the flow inside the loop.
One of the most frequent uses of a for loop is to repeat, that is, to apply the same sequence of commands to each element of a given list: a given task a defined number of times, using the function range, see Section 1.3.1: Lists.
for iteration in range(n): # repeat the following code n times
...
If the purpose of a loop is to go through a list, many languages (including Python) offer the following pattern:
for...
