Using the __builtins__ module to assign new global variables

[Opinder]

Hi, 

For the Python experts out there:

Are there any side effects in assigning new variables to the
__builtins__ module for the purpose of exposing variables to imported
modules.

For example.

#/ main file

class Test: pass

mytest = Test()  #/ instance of a class
__builtins__.mytest = mytest

import abc


#/ -----------------------
#/ This is the abc.py module file
#/ This should work because of the __builtins__ above
print mytest 

Thanks.