CODEWITHSUNDEEP
pythonlistpython-2.7sumfrequency
CHballer
CHballer

Reputation: 105

Python adding up the length of lists of number

So i am trying to find a specific word in txt file, and add up its occurrence, the code I used 

import re

pattern = re.compile(r"\bshall\b")
pattern1 = re.compile(r"\bmay not\b")
pattern2 = re.compile(r"\bmust\b")

with open('C:\Python27\projects\Alabama\New folder\\4.txt', 'r') as myfile:
 for line in myfile:
    m = re.findall(pattern, line)
    #m1 = re.findall(pattern1, line)
    #m2 =  re.findall(pattern2,line)

    k = len(m)
    #k1 = len(m1)
    #k2 = len(m2)
    #sumk = sum(len(k) for k in myfile)
    print k

when I print out k, it gives a vertical list of number of [0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 3, 0, 2........] I can tell that these are the number of occurrence of the string "shall" in each line of the text, my question is how to do I add up these list of numbers to get the sum/total occurrence of "shall" in the whole text file.

Upvotes: 0

Views: 99

Answers (2)

Ian
Ian

Reputation: 30813

If you intend to sum a list, you could use sum, but you need to define k outside such that it won't be replaced with new value every time:

k = [] #define k as empty list here
for line in myfile:
    m = re.findall(pattern, line)
    k.append(len(m)) #append the list with new item
val = sum(k) #get the sum here

Upvotes: 1

Razzi Abuissa
Razzi Abuissa

Reputation: 4112

One way is to use a running total:

total = 0
for line in myfile:
    m = re.findall(pattern, line)
    total += len(m)

print total

Upvotes: 1

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