Python string interpolation implementation

Question

[EDIT 00]: I\'ve edited several times the post and now even the title, please read below.

I just learned about the format string method, and its use with dictionarie

Answer 1

Modules don't share namespaces in python, so globals() for my_print is always going to be the globals() of my_print.py file ; i.e the location where the function was actually defined.

def mprint(string='', dic = None):
    dictionary = dic if dic is not None else globals()
    print string.format(**dictionary)

You should pass the current module's globals() explicitly to make it work.

Ans don't use mutable objects as default values in python functions, it can result in unexpected results. Use None as default value instead.

A simple example for understanding scopes in modules:

file : my_print.py

x = 10
def func():
    global x
    x += 1
    print x

file : main.py

from my_print import *
x = 50
func()   #prints 11 because for func() global scope is still 
         #the global scope of my_print file
print x  #prints 50