print

1. the range of the inside loop can depend on
2. that of the outer loop:

for i in range(10) :

    for j in range(i, 10) :
        print '*',
    print

1. a nested loop that prints a multiplication table:

for i in range(1,11) :

    for j in range(1,11) :
        print i*j,'\t',

(:source lang=python:)

"""Nested loops"""

1. for and while loops can be nested:

for i in range(4) :

    for j in range(3) :
        print i,j
    print

(:sourceend:)