python 3.x - Counting Frequencies -

i trying figure out how count number of frequencies word tags i-gene , o appeared in file.

the example of file i'm trying compute this:

45 wordtag o cortex  2 wordtag i-gene cdc33  4 wordtag o ppre  4 wordtag o how 44 wordtag o if 

i trying compute sum of word[0] (column 1) in same category (ex. i-gene) same category (ex. o)

in example:

the sum of words category of i-gene 2
, sum of words category of o 97

my code:

import os  def reading_files (path):      counter = 0      root, dirs, files in os.walk(path):          file in files:             if file != ".ds_store":                 if file == "gene.counts":                     open_file = open(root+file, 'r', encoding = "iso-8859-1")                     line in open_file:                         tmp = line.split(' ')                          words in tmp:                              word in words:                                 if (words[2]=='i-gene'):                                    sum = sum + int(words[0]                                 if (words[2] == 'o'):                                    sum = sum + int(words[0])                              else:                                 print('nothing')                          print(sum) 

i think should delete word loop - don't use it

for word in words: 

i use dictionary - if want solve generally. while read file, fill dictionary with: - if have key in dict -> increase value - if new key, add dict, , set value it's value.

def reading_files (path): freqdict = dict() ... words in tmp:     if words[2] not in freqdict():         freqdict[words[2]] = 0     freqdict[words[2]] += int(words[0]) 

after created dictionary, can return , use keyword, or can pass keyword function, , return value or print it. prefer first 1 - use less file io operation possible. can use collected data memory.

for solution wrote wrapper:

def getvalue(fdict, key): if key not in fdict:     return "nothing" return str(fdict[key]) 

so behave example.

it not neccessary, practice: close file when not using anymore.