CODEWITHSUNDEEP
pythonmoduleglobal-variablespython-import
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Reputation: 20880

python module with module-wise global variable

I made a python file with several functions in it and I would like to use it as a module. Let's say this file is called mymod.py. The following code is in it. 

from nltk.stem.porter import PorterStemmer                      
porter = PorterStemmer()  

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

Then I tried to import it in iPython and use tokenizer_porter: 

from mymod import * 
tokenizer_porter('this is test')

The following error was generated

TypeError: unbound method stem() must be called with PorterStemmer instance as first argument (got str instance instead)

I don't want to put porter inside the tokenizer_porter function since it feels redundant. What would be the right way to do this? Also, is it possible to avoid 

from mymod import *

in this case?

Many thanks!

Upvotes: 1

Views: 154

Answers (1)

Andrey Ershov
Andrey Ershov

Reputation: 1803

To access global variables in python you need to specify it in fucntion with global keyword

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

Upvotes: 1

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