你如何在python中调用一个函数？

Question

Ok guys, this is driving me crazy. I know java, but python is nuts. I'm just trying to writing a simple counter program using a for loop, but I can't do that because this language is made for weirdos. Haha, ok just kidding on that one, but seriously, what am I doing wrong?

class makeLines:
    def main():
       counter()
        
    def counter():
        for i in range(0,10):
            print(i)

When I run it, nothing happens. No output...

Answer 1

You call functions in Python exactly as in Java:

function_name(args…)

Your code doesn't work because its indentation is broken. Furthermore, there is no global code calling any function. Unlike Java, Python code doesn't have to be inside classes, and there is no entry point. Just call the function directly:

def counter():
    for i in range(0,10):
        print(i)
        
counter()

You can create an entry point function, and this is in fact often a good idea. So you will see a lot of code in Python that looks as follows :

import sys


def main():
    ‹main logic here›


if __name__ == '__main__':
    sys.exit(main())

The reason for this is to make code usable as both a module and an executable .

Answer 2

Erase your first and second lines, because you don't need any classes and main() function(it's not C++ or Java, there's no such thing like main function in Python) in that case. And you must add the space before your 'for' loop.