Home/ Questions/How to deal with ''takes 2 positional arguments but 3 were given'' error?
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thereseblanda
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Asked: 2022-08-04T05:30:57+00:00 In:

How to deal with ”takes 2 positional arguments but 3 were given” error?

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I still get the error ”takes 2 positional arguments but 3 were given” when running my program:

class MyClass:

    def method(arg):
        print(arg)

I use it to create an object…

my_object = MyClass()

When I call method("foo"), I receive the error message:

>>> my_object.method("foo")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: method() takes exactly 1 positional argument (2 given)

I don’t know how to resolve the issue. Can someone help me?

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1 Answer

  1. Best Answer
    Expert

    The cause: The reason is that all instance methods expect a first arg which by custom we call self. The correct declaration for a method is def method(self, arg):, not the  def method(arg): his issue occurs when the method dispatch tries to call method(arg): and match up two parameters self, arg against it. 

    Solution: You need to add self argument as the first argument to all defined methods in classes:

    class MyClass:
    def method(self, arg):
        print(arg)

    After that, you can use your strategy based on your intuition:

    >>> my_object = MyClass()
>>> my_object.method("foo")
foo
    • 3

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