Share variables between functions

Question

I want to share variables between two functions: from the bottom one to the top one

def number_function():
   print(number_1)
   print(number_2)

number_function()

def test():
   number_1=10
   number_2=20

When I have tried to run the code I get this error

NameError: name 'number1' is not defined

Variables are scoped to functions. If you want to access those variables, `test()` should return them. — Mark, Jul 24 '19 at 23:21
Possible duplicate of [Reference: What is variable scope, which variables are accessible from where and what are "undefined variable" errors?](https://stackoverflow.com/questions/16959576/reference-what-is-variable-scope-which-variables-are-accessible-from-where-and) — Jin Lee, Jul 25 '19 at 02:31

realr · Answer 1 · 2019-07-25T00:19:50.790

As pointed out by Mark Meyer, the variables are scoped to functions and there is no way for variables inside test to exist if you do not call the function test() function.

In case you do run test() and don't want to return and pass variables to other functions, you would need to define the variables as global, so they are not confined to the function scope.

def test():
    global number_1
    global number_2
    number_1=10
    number_2=20

def number_function():
    print(number_1)
    print(number_2)

test()
number_function()

Out[1]:
10
20

Another way to share variables across functions is to simply use classes:

Class yourEnv(object):

    def __init__(self):
         self.number_1 = 10
         self.number_2 = 20

    def number_function(self):
        print(self.number_1)
        print(self.number_2)

yourEnv().number_function()

Out[2]
10
20

Thank you very much for the answer . – Hassaine Hassen Jul 26 '19 at 14:36 — Hassaine Hassen, Jul 26 '19 at 14:36
can i do the reverse?, for example : – Hassaine Hassen Jul 26 '19 at 14:37 — Hassaine Hassen, Jul 26 '19 at 14:37

score 0 · Answer 2 · answered Jul 26 '19 at 14:40

0

can id do the reverse ?, for example :

def test():
    print(number_1)
    print(number_2)        

def number_function():

    global number_1
    global number_2
    number_1=10
    number_2=20
test()
number_function()

answered Jul 26 '19 at 14:40

Hassaine Hassen

11
4

Variables have to be defined first, how can you print them if they do not exist yet? – realr Jul 26 '19 at 14:51
Okay thank you , i thought it was a way to did it but i find out that i must define the first. – Hassaine Hassen Aug 12 '19 at 09:13

Share variables between functions

2 Answers2