从列表元组返回随机值

Question

如何从此列表元组返回随机键值？我只关心从动作中返回'r'，'p'或's'。

# Snippet

moves = [('r', "rock"), ('p', "paper"), ('s', "scissors")]

view_all(moves):
    print "Player moves:"
    for move in moves:
        print " => ".join((move[0], move[1]))

Answer 1

使用random.choice。

>>> import random
>>> moves = [('r', "rock"), ('p', "paper"), ('s', "scissors")]
>>> random.choice(moves)
('s', 'scissors')

如果只需要元组的第一个值：

random.choice(moves)[0]

Answer 2

使用random.choice。

>>> import random
>>> moves = [('r', "rock"), ('p', "paper"), ('s', "scissors")]
>>> print random.choice(moves)[0] 
's'

Answer 3

import random
moves = [('r', "rock"), ('p', "paper"), ('s', "scissors")]
move_keys = [ x[0] for x in moves ]

print random.choice(move_keys)

Answer 4

使用random模块。

random.choice(A)或A[random.randint(0,len(A)-1)]