Python如何包含另一个文件的功能

Question

I have a problem with including a function from another file to main executable script. I have too many functions and my main script became too long and hard to manage. So i've decided to move every function to separate file and than attach/include it. I've read nearly any relative post here to resolve my problem but no luck. Let's see:

main_script.py
==================
from folder.another_file import f_fromanotherfile

class my_data:
     MDList=[]

work=my_data()

def afunction():
    f_fromanotherfile()
    return

and

another_file.py
=====================
#In this file i've put just function code
def f_fromanotherfile():
    a=[1,2,3,4]
    work.MDList=a
    return

And this is the error:

line 11, in f_fromanotherfile work.MDList=a NameError: global name 'work' is not defined

Help me please

Answer 1

The scope of 'work' is its module, main_script.py, so you cannot access it from another module. Make 'work' an argument of f_fromanotherfile instead:

In another_file.py:

def f_fromanotherfile(work):
  # function body stays the same

In main_module.py:

def afunction():
  f_fromanotherfile(work)

Answer 2

because in another_file.py

#In this file i've put just function code
def f_fromanotherfile():
    a=[1,2,3,4]
    work.MDList=a
    return 

work is not a global variable.And then doing assignment to it can't work.

u should change ur code to: another_file.py

#In this file i've put just function code
def f_fromanotherfile():
    global work
    a=[1,2,3,4]
    work.MDList=a
    return

with the global keyword u can say the variable in so-called global scope and do ur assignment.

PS:kind of like the keyword extern in C?