Question

我有这个非常奇怪的错误，我不知道它是什么。这是我的代码：

def wordChoice():
    theme = themechoice
    word = theme[randint(0, len(theme) - 1)]

这是错误：

Traceback (most recent call last):
    File "C:\Users\Andrei\Documents\USB Backup\Python\Hangman.py", line 31, in wordChoice
            word = theme[randint(0, len(theme) - 1)]
          File "C:\Users\Andrei\AppData\Local\Programs\Python\Python35-32\lib\random.py", line 218, in randint
            return self.randrange(a, b+1)
          File "C:\Users\Andrei\AppData\Local\Programs\Python\Python35-32\lib\random.py", line 196, in randrange
            raise ValueError("empty range for randrange() (%d,%d, %d)" % (istart, istop, width))
        ValueError: empty range for randrange() (0,0, 0)

我到处搜索，但找不到任何东西。如果这是显而易见的话，我也有点新手了。

编辑：

在我为此设置主题之前：

def themeChoice():
    n = 0
    for i in themes:
        n += 1
        print(str(n) + " - " + i)
    themechoice = themesToThemes[themes[int(input("Type the number corresponding to your chosen theme: ")) - 1]]
    print (themechoice)

Answer 1

theme为空时会发生此错误。

>>> theme = []
>>> random.randint(0, len(theme)-1)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Programming\Python 3.5\lib\random.py", line 218, in randint
    return self.randrange(a, b+1)
  File "C:\Programming\Python 3.5\lib\random.py", line 196, in randrange
    raise ValueError("empty range for randrange() (%d,%d, %d)" % (istart, istop, width))
ValueError: empty range for randrange() (0,0, 0)

在尝试从中随机选择元素之前，请确保theme实际上包含元素。另外，请考虑使用random.choice而不是使用randint手动生成索引。

带有randint的ValueError

1 个答案: