random.choice

import random

a = range(1, 100)

def r1():
  return random.choice(a)

def r2():
  return a[random.randint(0, len(a)-1)]
  
"""
Save as test.py and:

$ python -mtimeit -n 10000 -s 'import test' 'test.r1()'
10000 loops, best of 3: 0.921 usec per loop
$ python -mtimeit -n 10000 -s 'import test' 'test.r2()'
10000 loops, best of 3: 2.59 usec per loop
"""