Python Programming with Raspberry Pi

Nested loops

In Python, it is possible to implement a loop within a loop. For example, let's say we have to print x and y coordinates of a map. We can use nested loops to implement this:

for x in range(0,3):    for y in range(0,3):          print(x,y)

The expected output is:

Be careful about code indentation in nested loops as it may throw errors. Consider the following example:

for x in range(0,10):    for y in range(0,10):    print(x,y)

The Python interpreter would throw the following error:

    SyntaxError: expected an indented block

This is visible in the following screenshot:

Hence, it is important to pay attention to indentation in Python (especially ...