How to use a returned variable from a previous function in another function? (python)

I want to use a list that was created from a previous function in my other function.
After a bit of research it seems using return is the way of doing it. However I cannot get it to work.
This is my code:

def FunctionA():
  all_comments1 = [1,2,3,4]
  return all_comments1

def FunctionB():
  FunctionA()
  all_comment_string1 = ''.join(all_comments1)
  newlistings1 = all_comment_string1.split('\n')
  print(newlistings1)

def DoSomething():
  FunctionB()

  DoSomething()

It gives me an error:

NameError: name ‘all_comments1’ is not defined

MEDevel.com: Open-source for Healthcare and Education

Collecting and validating open-source software for healthcare, education, enterprise, development, medical imaging, medical records, and digital pathology.

Visit Medevel

I want to know how I can define the variable successfully.

>Solution :

You have to define a new variable. Right now you call the FunctionA() but don’t save its return value. To do so, simply make a new variable like so:

def FunctionA():
    all_comments1 = [1,2,3,4]
    return all_comments1

def FunctionB():
    all_comments = FunctionA()
    print(all_comments)

FunctionB()

>> [1,2,3,4]