检查Python函数中传递的参数数量 [英] Check the number of parameters passed in Python function

问题描述

我是 Python 新手，想知道是否有一种简单的方法可以获取 Python 函数中传递的参数数量.

I'm new in Python and wants to know if there is a simple way to get amount of passed parameters in Python function.

a(1, 2, 3) ==>3
a(1, 2) ==>2

推荐答案

你可以使用 locals() 来做到这一点

You can do this by using locals()

重要的是要注意，这应该作为最终方法的第一步来完成.如果在您的方法中引入一个新变量，您将改变您的结果.因此，请确保按照以下方式进行操作:

It is important to note, that this should be done as ultimately, your first step in your method. If you introduce a new variable in your method, you will change your results. So make sure you follow it this way:

def a(a, b, c):
    # make this your first statement
    print(len(locals()))

如果你这样做了:

def a(a, b, c):
    z = 5
    print(len(locals()))

您最终会得到 4，这不符合您的预期结果.

You would end up getting 4, which would not be right for your expected results.

关于 locals()

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