Python: insert into arrays based on condition -

the code below producing error:

traceback (most recent call last):   file "pulllist2.py", line 28, in <module>     list_sym[w] = symbol indexerror: list assignment index out of range 

what trying achieve here add element array if word1 , word2 in string of security_name. not know way initialize arrays either.

#!/usr/bin/env python3 import glob import os import sys import fnmatch  list_sym = [] list_name = [] w = 0 count = 0 word1 = 'stock' word2 = 'etf'  # loop parses lines appropriate variables file in glob.glob('./stocklist/*.txt'): open(file) input:      line in input:         # split line variables.. trash have no use         symbol, security_name, trash = line.split('|', 2)          if word1 in security_name or word2 in security_name:              # stores values in array             list_sym.append(1) ## initialize arrays             list_name.append(1)             list_sym[w] = symbol             list_name[w] = security_name             count += 1          w += 1 

you've initialized lists here, albeit empty list:

list_sym = [] 

this fine, however, happens when add list? can use append method.

list_sym.append(whatever) 

it looks come old languages (java or c or c++). braces , fixed array lengths , boring stuff that. don't have index do.

appending list, add list. can add list.

list_sym.append(5345034750439) list_sym.append("yo. what's up!") 

this safer you, can add, , not try , position. appending way go.

to find length:

>>> len(list_sym) 10 # there's 10 objects in list. 

let me recommend dictionary, said:

dictionaries allow pair objects together, assigning variables. it's simple this:

my_dictionary = {} 

to add object, need key , value.

my_dictionary["name"] = "zinedine"                 ^           ^                key         value 

to access value, need know key (how treasure without golden key). trying index list, value same concept. dictionaries commonly used pair objects, or store multiple variables under common scope. hope find useful! :)