How can I access a Variable from within a Fuction (Method) that's in another Module

Question

I have 2 Modules, the first module has class One with a function which returns a value. The second has 2 classes Two and Three with functions. I've imported the class from the first module into the second.

In function i of Class Two I've assigned the function x from class One to y. from there I can access returned value by printing y, the function also returns a variabletype needed else where in the program.

but also need to access this same variable y from within function z in class Three.

The method I've used in class Three returns an error. I've tried using getattr but found no joy. But I believe I may have been using it wrong.

The only other solution I've had is to return y along with type. Then assign the function i in class Two to pop in function z of class Three. But this calls the function from x in class One which means I have to enter another value then it prints multiple unneeded lines.

I've created a mock of this problem to try and find a solution but I'm a little stuck. I need to access the value from y in function i of class Two multiples times in a number of other classes.

Method one:

Module 1: TestOne.py

class One():
    def x(self):
        Go = input("Please enter value\n")
        return Go

Module 2: Test.py

from TestOne import*


class Two():
    def i(self):
        type = "Move"
        y = One.x(self)
        print("Test 1: ",y)
        return  type




class Three():
    def z(self):
        print("Test 2: ", Two.i.y)

Module 3: TestMain.py

from Test import*


p = Two()

t =Three()

p.i()
t.z()

Error:

PS C:\Users\3com\Python> python testmain.py
Please enter value

Test 1:
Traceback (most recent call last):
  File "testmain.py", line 9, in <module>

    t.z()
  File "C:\Users\3com\Python\Test.py", line 16, in z
    print("Test 2: ", Two.i.y)
AttributeError: 'function' object has no attribute 'y'

Method 2:

Module 1: TestOne.py

class One():
    def x(self):
        Go = input("Please enter value\n")
        return Go

Module 2: Test.py

from TestOne import*


class Two():
    def i(self):
        type = "Move"
        y = One.x(self)
        print("Test 1: ",y)
        return  type, y




class Three():
    def z(self):
        pop = Two.i(self)[1]
        print("Test 2: ", pop)

Module 3: TestMain.py:

from Test import*


p = Two()

t =Three()

p.i()
t.z()

Output:

PS C:\Users\3com\Python> python testmain.py
Please enter value
1
Test 1:  1

Please enter value
1
Test 1:  1
Test 2:  1

Edit: I've done a little digging and have a solution that solves the problem. using global. But have found a number of articles which say that the use of global can be somewhat dangerous if not used correctly,

Method 3: Working Solution. Meets desired output.

Module 1: TestOne.py

class One():
    def x(self):
        Go = input("Please enter value\n")
        return Go

Module 2: Test.py

from TestOne import*

class Two():
    def i(self):
        type = "Move"
        global y
        y = One.x(self)
        print("Test 1: ",y)
        return  type


class Three():
    def z(self):

        print("Test 2: ", y)

Module 3: TestMain.py:

from Test import*


p = Two()

t =Three()

p.i()
t.z()

Output:(Desired Output)

PS C:\Users\3com\Python> python testmain.py

Please enter value
1
Test 1:  1
Test 2:  1

leban ali · Accepted Answer · 2019-11-22T06:36:23.763

Having done research and looking for similar problems I found that using a dictionary is one of the easier and safer ways to be able to access the needed information. whilst trying to use global I found that I had encountered a number of problems also the program was not running as expected. With the current method I can access the values stored in the dictionary by importing them to needed module and can also easily make changes

This is the modified solution:

Module 1: TestOne.py

my_dict ={'Go':None}

class One():
    def x(self):
        my_dict['Go'] = input("Please enter value\n")

my_dict is defined as a dictionary with a key:Go and the value set to None. In function x of class One, my_dict['Go'] is given the value derived from input.

Module 2: Test.py

from TestOne import*


class Two():
    def i(self):
        type = "Move"

        One.x(self)
        print("Test 1: ", my_dict["Go"])
        return  type




class Three():
    def z(self):

        print("Test 2: ", my_dict["Go"])

In class Two I no longer need to assign One.x(self) to y. The value of 'my_dict['Go']` in now accessible as it has been imported from the module 'TestOne.py'

Module: TestMain.py

from Test import*


p = Two()

t =Three()

p.i()
t.z()

Output:

Please enter value
1
Test 1:  1
Test 2:  1

Accessing "Module Scope" Var

How can I access a Variable from within a Fuction (Method) that's in another Module

1 Answers1