Python：函数参数组合验证

Question

尝试验证函数参数组合。这样()、(project)、(project,field)和(project,field,well)是有效的，而其他组合（例如(field)）是无效的。如果可用，参数将是字符串，否则默认值为None或空字符串“”。目前正在做穷人的口罩检查

def make_thing(project=None, field=None, well=None):
    # check for valid p-f-w combinations
    check = (8 if project else 0) + (4 if field else 0) + (1 if well else 0)
    if check not in (0, 8, 8 + 4, 8 + 4 + 1):
        return None

    # continue to do work

问题：做这件事的正确方法是什么

谢谢大家!

Answer 1

第一条建议

def make_thing(project=None, field=None, well=None):
    if (not project and field) or (not field and well):
        return

    # continue to do work

第二个建议

def make_thing(project=None, field=None, well=None):
    if (bool(project), bool(field), bool(well)) not in (
        (False, False, False),
        (True, False, False),
        (True, True, False),
        (True, True, True),
    ):
        return

    # continue to do work