Loops are control structures that iterate over a range to perform a certain task. They can work with any iterable type, such as lists and dictionaries. To control the loop in this problem, use the range function (see below for a description).

There are two kinds of loops in Python.

A for loop:

for i in range(0, 5):
    print i

And a while loop:

i = 0
while i < 5:
    print i
    i += 1

When using a for loop, the next value from the iterator is automatically taken at the start of each loop. When using a while loop, the iterator must be initialized prior to the loop, and the value updated within the loop.

Note Be careful about indentation in Python. Read more

The range() function

The range function is a built in function that returns a series of numbers. At a minimum, it needs one integer parameter.

• Given one parameter, , it returns integer values from to . For example, range(5) returns the numbers through in sequence.
• To start at a value other than , call range with two arguments. For example, range(1,5) returns the numbers through .
• Finally, you can add an increment value as the third argument. For example, range(5, -1, -1) produces the descending sequence from through and range(0, 5, 2) produces , , . If you are going to provide a step value, you must also include a start value.

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