Question

As the title says, do I need to reimport a module in a module that I imported to my main file? Can’t find anything on this and not really sure what to search for either. Cause this don’t work until I import otherepic in epicness

file1:

import epicness
import otherepic

epicness.someother(3)

epicness:

def someother(x):
    return dosomething(x)

otherepic:

def dosomething(x):
    return x*4

Answer 1

Yes, you have to import everything you need in every module. If in module_a you use the function B defined in module_b then you must import module_b inside module_a, or at least import the B function from module_b.

Explanation:

In Python modules are objects! When you import a module its code is executed and everything that gets defined there is attached to the module object’s __dict__:

$ echo 'a=1' > testing.py
$ python
Python 2.7.3 (default, Aug  1 2012, 05:14:39) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import testing
>>> 'a' in testing.__dict__
True

The module’s __dict__ contains also the usual global built-ins.
Anything that is defined inside a module uses the module’s __dict__ as global scope.
In python there is no such a thing as a “global variable” meaning a variable accessible from every module/class/function. Globals variables are actually just a module’s instant variables.

If you want to import some items from a module into an other module’s namespace you can use the from syntax:

from module_a import functionA, functionB, classA, CONSTANT

You can import everything using the *:

from module_a import *

But avoid using the from ... import * syntax! You’ll get namespacing clashes like in C includes. Only do this if a module states in its documentation that it is *-import safe.
To make a module *-import safe you can define the __all__ global, which should be a sequence of strings representing the identifiers that should be exported when a *-import is executed.

For example:

#module_a
A = 1
B = 2
__all__ = ['A']

#module_b
from module_a import *
print(A)   #okay
print(B)   #NameError, B was not exported!