Python, problems with global variable -

i declare global variable pos, anyway method printarr() doesn't see it. interpreter says: undifined variable pos. why? thanks

import nltk   class analyzer():      """implements sentiment analysis."""          def __init__(self, positives, negatives):         global pos         global neg         positives=[]         negatives=[]         i=0         file = open("negative-words.txt","r")         line in file:             h=file.readline()             if h!="":                 if h[0]!=';':                     negatives.append(h)                     i=i+1                     print(h)          i=0         file = open("positive-words.txt","r")         line in file:             h=file.readline()             if h!="":                 if h[0]!=';':                     positives.append(h)                     i=i+1                     print(h)         neg=negatives         pos=positives       def printarr (self, arr):         print (pos[2])     """initialize analyzer.""" 

i'll try make easier: next code not work properly, program still prints out "0", not "5"

import os import sys global x x=0  def func1():     x=5 def func2():     print (x)  func2() 

python local variables first before searching in global scope.

your func2() refer global value of x x not defined locally.

you try nest 2 functions.

func2(func1())

that way func1 assign value 5 variable x , func2 return 5 instead of 0.

hope helps.