python在for循环中迭代多个值

Question

我的for循环有for value1, value2 in args失败了，我不知道为什么

def school_completion(*args):
    """
    If any of the subjects have one or more incomplete testlet, the whole school is
    incomplete.

    :param args: tuple of 7 strs
        Should come as:
        (Eligible Students,
        ELA Required,
        ELA Completed,
        Math Required,
        Math Completed,
        Science Required,
        Science Completed)
    :return: str
    """
    # If there are no eligible students, return a dash.
    if args[0] == '0':
        return '-'

    # Set a boolean trigger.
    complete = True

    # Check for each subject pair.
    for required,completed in args[1:]:
        if required != completed:
            complete = False

    return 'Complete' if complete else 'Follow Up'

school_completion('1','6','6','7','7','8','8')

这给了我一个错误ValueError: not enough values to unpack (expected 2, got 1)，似乎发生在for required,completed in args[1:]

我还尝试让我的函数接受(arg, *args)（从而避免了切分元组时的任何错误）。那也没用

Answer 1

在序列中解包项要求序列中的每个项都是一个iterable，它生成的项数与接收值的表达式所期望的项数相同。您可以使用zip函数在按奇数和偶数索引对序列中的项进行切片后，对它们进行配对

更改：

for required,completed in args[1:]:

致：

for required, completed in zip(args[1::2], args[2::2]):