Question

我正在编写一个Python 3.3.3中的代码，如果你输入12，那么会列出32个团队，并确保重复次数最多的团队只重复一次，而不是重复次数最多。如果这样做了：

    import random
    teams =[]
    randoms = []
    team = 0
    amount = 1
    while team != "done":
        team = input("Please enter team name " + str(amount) +" or enter 'done' if you have finished.\n")
        if team != "done":
            teams.append(team)
            randoms.append(team)
            amount = amount + 1
    length = len(teams)
    times =0
    while len(teams) != 32:
        while len(teams) <= 32-length:
            for x in range (0,length+1):
                teamname = teams[x]
                teams.append(teamname)
        else:
           choice = random.choice(randoms)
           teams.append(choice)
           randoms.remove(choice)
        teams.sort()
    for x in range(0,len(teams)):
        print (teams[x])

我运行程序并输入12个团队然后完成。它提供了以下消息：

Traceback (most recent call last):
  File "C:\Python33\lib\random.py", line 248, in choice
    i = self._randbelow(len(seq))
  File "C:\Python33\lib\random.py", line 224, in _randbelow
    r = getrandbits(k)          # 0 <= r < 2**k
ValueError: number of bits must be greater than zero


During handling of the above exception, another exception occurred:


Traceback (most recent call last):
  File "[File location]", line 30, in <module>
    choice = random.choice(randoms)
  File "C:\Python33\lib\random.", line 250, in choice
    raise IndexError('Cannot choose from an empty sequence')
IndexError: Cannot choose from an empty sequence

这是什么意思，我该如何解决这个问题？

Answer 1

random.choice（）函数中的数组为空时发生该错误。我建议您使用Python调试器来确定数组何时完全为空。它可以帮助您添加一行代码来打印len（团队）每个循环，以查看编码的混乱程度。它可以像＆gt;一样简单。与＆gt; =。

希望这有帮助！

Python - ＆＃34;随机＆＃34;错误

1 个答案: