在没有if的情况下通过多个条件传递变量？

Question

What I'm trying to do is to pass a variable through a function that has a list of multiple lambda condition functions.

This function should behave by either returning 1 if all conditions are met or stopping the "iteration" and returning which conditions was not met.

Something like this:

def is_conditions_met(y):

    conditions = (lambda x: 1 if isinstance(x, int) else return "Wrong type",
                  lambda x: 1 if x % 2 == 0 else return "Not even",
                  lambda x: 1 if x >= 40 else return "Less than 40")

    return all(conditions, y)

    >>> is_condition_met('foo')
    >>> ' Wrong type '

    >>> is_condition_met(14)
    >>> ' Less than 40 '

    >>> is_condition_met(42)
    >>> True

Answer 1

I think you should use IF, but use it more effective. In you variation all 3 functions will be executed no matter what. I suggest to check conditions step by step. For example, you don't need to execute 2 last functions if TYPE is not INT. So my variation is:

def is_conditions_met(y):
    if not isinstance(y, int):
        return "Wrong type"

    # If type is INT we can check next condition and etc.
    if not y % 2 == 0:
        return "Not even"

    if not y >= 40:
        return "Less than 40"
    
    return True