NameError when calling function outside class-CodePudding

Here is my test code:

class test():
    def testing(self, val):
        print(val)

test.testing(some_input_variable)

Output:

NameError: name 'some_input_variable' is not defined

I cannot figure out why this does not work. If the function was not inside of the class, it works fine. This specific code is a general form of a piece of code I'm trying to use as a proof of concept for another piece of code.

CodePudding user response：

There's nothing much to explain, really. You didn't define some_input_variable, so you get a NameError when you try to use it as the argument to test.testing. Define it, and that particular error goes away.

>>> class test():
...     def testing(self, val):
...         print(val)
...
>>> test.testing(some_input_variable)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'some_input_variable' is not defined
>>> some_input_variable = 3
>>> test.testing(some_input_variable)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: testing() missing 1 required positional argument: 'val'

Now you get a TypeError instead of a NameError, because test.testing expects to arguments, because you didn't use an instance of test to invoke the method. Create the instance, and everything works fine.

>>> test().testing(some_input_variable)
3

CodePudding user response：

You are trying to call the testing method as a staticmethod but haven't defined it as a static method.

class test():
    @staticmethod
    def testing(input_var):
        print(input_var)

test.testing(input_var)