关于将变量分配给 function 的基本问题

Question

Let's say i want to import and use a function func1 from a module func.py as a variable f. I would like to use a short name f so that i don't have to write func.func1 everytime i use it.

The module func.py is

    def func1(n):
        print(n+1)

and i want to import func

    import func
    f = func.func1()

Why does it show error in () as "func1 missing 1 required positional argument n"?

    import func
    f = func.func1

while this doesn't show error?

what is the difference between func.func1 and func.func1()?

Answer 1

When you do f = func.func1() , you are attempting to call func1 , and bind its return value to f . That's not what you intend, and it doesn't work since func1 expects to be given an argument when it is called. But when you put the () on the end, Python sees you making a function call.

When you leave off the () , there's no call being done, you're just binding the function to a new name. As has been mentioned in the comments, you can do this in the same step as your import statement, with from func import func1 as f .

Answer 2

This is a quick answer. When you do f = func.func1() you need to pass a variable into the func1(var). In your module it contains a variable called n. N is used to be added to one correct? So when you call the module you also need to give it n or any other variable but make sure its an int. :

n = 10
f = func.func1(n)

Now it should work fine. All you have to do Is pass a variable inside the parrenthases and it should work.