Import module, that import another module. Python

Question

I was curious what happens when we import a module that in turn imports another module. So I create two modules: module1 and module2.

module1:

import random
print(random.randint(0,10))
print("module1 work")

module2:

import module1
print("module2 work")

When I run module2 it give me this output:

1
module1 work
module2 work

So, I decided that I did indeed import random, when I imported module1. But when I type in the Shell print(random.randint(0,10))it throws a NameError: name 'random' is not defined. So random wasn't imported from module1. But in this case why did module2 print 1, and didn't throw the same error as the Shell?

Just because a module has been executed doesn't necessarily mean the module object is bound to a name in the global namespace. Try module1.random.randint(0,10). — chepner
– chepner, Commented Nov 10, 2017 at 15:07

steliosbl · Accepted Answer · 2017-11-10 15:11:24Z

6

Each module has its own scope (or namespace, if that terminology is more familiar to you). If you want to access random from module2, you need to import it in module2. The interpreter shares the scope of the module you execute, so only variables declared in the global namespace of that module will be accessible. If you want to access random from the interpreter having only imported module2, you'll need to specify module1.random.

Alternatively, you can replace import module1 with from module1 import *. That will copy over everything, including the reference to random. So random will be accessible globally.

edited Nov 10, 2017 at 15:11

answered Nov 10, 2017 at 15:05

steliosbl

8,9275 gold badges33 silver badges57 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Sheshnath Over a year ago

or you could do print(module1.random.randint(0,10)), if you don't want to import random in module2

Blazeoffury49er · Accepted Answer · 2017-11-10 15:08:54Z

1

It is because you are not actually importing random into the shell, instead just the file that contains the module.

We can use an existing module as an example, for example tkinter which opens with:

import enum
import sys

They import into the Tkinter module but when you import Tkinter they don't come with it.

To put it is as simply as possible your module1 has random imported, but imporing module1 will not also import random

answered Nov 10, 2017 at 15:08

Blazeoffury49er

1351 silver badge7 bronze badges

Collectives™ on Stack Overflow

Import module, that import another module. Python

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related