import random

rows = int(raw_input("Height: "))
cols = int(raw_input("Width: "))

m = []

for row in range(rows):
    line = []
    for col in range(cols):
        line.append(random.randrange(100))
    m.append(line)

for row in range(rows):
    for col in range(cols):
        print str(m[row][col]).rjust(3),
    print

---------

import random

rows = int(raw_input("Height: "))
cols = int(raw_input("Width: "))

for row in range(rows):
    for col in range(cols):
        print str(random.randrange(100)).rjust(5),
    print