CODEWITHSUNDEEP
pythonpython-3.x
ewelina
ewelina

Reputation: 49

Importing global variables in python in two ways

I came across a situation I don't understand. I have three files:

one.py (runnable):

import two
import three

three.init()
two.show()

two.py:

import three

def show():
    print(three.test)

three.py:

test = 0

def init():
    global test
    test = 1

The outcome is 1, as I expected. Now let's modify two.py:

from three import test

def show():
    print(test)

The outcome is 0. Why?

Upvotes: 4

Views: 53

Answers (1)

scriptmonster
scriptmonster

Reputation: 2771

It's all about scope. If you change your one.py as follows you would see better.

import three
from three import test

three.init()

print(test)
print(three.test)

it will print:

0        <== test was imported before init()
1        <== three.test fetches the current value

When you import only variable it will create a local variable which is an immutable integer.

But if you change order of the import statement like following you would get a different result:

import three

three.init()
print(three.test)

from three import test
print(test)

it will print:

1        <== three.test fetches the current value
1        <== test was imported after init()

Upvotes: 1

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