def main():
  def process(data):
     .....
  def process1(data):
     .....
  def process2(data):
     .....
  def run():
     test = choice([process,process1,process2])
     test(data)
  run()

main()

import random

def main():
  def process(data):
     return data + [0]
  def process1(data):
     return data + [9]
  def process2(data):
     return data + [7]
  def run(data):
     test = random.choice([process,process1,process2])
     print test(data)
  for i in range(7):
    run([1, 2, 3])

main()

[1, 2, 3, 7]
[1, 2, 3, 0]
[1, 2, 3, 0]
[1, 2, 3, 7]
[1, 2, 3, 0]
[1, 2, 3, 9]
[1, 2, 3, 9]

random.choice(seq)

from random import choice

import random

def main():
  def process(data):
     .....
  def process1(data):
     .....
  def process2(data):
     .....
  def run():
     test = random.choice([process,process1,process2])
     test(data)
  run()

main()

import random
from pygame import mixer


def ms1():
    mixer.init()
    mixer.music.load('/Users/anonsec/Downloads/song_music/Levitate.mp3')
    mixer.music.play()


def ms2():
    mixer.init()
    mixer.music.load('/Users/anonsec/Downloads/song_music/GoldDust.mp3')
    mixer.music.play()


def ms3():
    mixer.init()
    mixer.music.load('/Users/anonsec/Downloads/song_music/illenium.mp3')
    mixer.music.play()


random.choice([ms1,ms2,ms3])()