python module with module-wise global variable -

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i made python file several functions in , use module. let's file called mymod.py. following code in it. 

from nltk.stem.porter import porterstemmer                       porter = porterstemmer()    def tokenizer_porter(text):                                                                                         return [porter.stem(word) word in text.split()]

then tried import in ipython , use tokenizer_porter: 

from mymod import *  tokenizer_porter('this test')

the following error generated

typeerror: unbound method stem() must called porterstemmer instance first argument (got str instance instead)

i don't want put porter inside tokenizer_porter function since feels redundant. right way this? also, possible avoid 

from mymod import *

in case?

many thanks!

to access global variables in python need specify in fucntion global keyword

def tokenizer_porter(text):          global porter                                                                                return [porter.stem(word) word in text.split()]

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