Python Essential Reference, Second Edition

Loops

You implement loops using the for and while statements. For example:

while expression: 
    statements 

for i in s: 
    statements
				

The while statement executes statements until the associated expression evaluates to false. The for statement iterates over all the elements in a sequence until no more elements are available. If the elements of the sequence are tuples of identical size, you can use the following variation of the for statement:

for x,y,z in s: 
    statements
				

In this case, s must be a sequence of tuples, each with three elements. On each iteration, the contents of the variables x , y , and z are assigned the contents of the corresponding tuple.

To break out of a loop, use the break statement. For example, the following function reads ...