text count from csv | Python Fiddle

import string
from collections import defaultdict

text = '''S/m,Text\n1,What a happy day.\n2,Happy new year\n3,Holy Cow'''

wordcheck = defaultdict(list)
# Instead of using the string, you can also uncomment line 8 and comment line 9
#for line in open('infile.txt'):
for line in text.split('\n'):
    serial,_,comment = line.partition(',')
    if serial.isdigit():
        # Cheatline to process comments (remove punctuations, lower case)
        comment = "".join([i.lower() for i in comment if i not in string.punctuation])
        for word in comment.split():
            wordcheck[word].append(serial)

for i in wordcheck:
    print i+","+",".join(wordcheck[i])

print "#######################################"

wordcheck = defaultdict(list)
for line in text.split('\n'):
    serial,_,comment = line.partition(',')
    if serial.isdigit():
        # Cheatline to process comments (remove punctuations, lower case)
        comment = "".join([i.lower() for i in comment if i not in string.punctuation])
        for word in comment.split():
            wordcheck[serial].append(word)

for i in wordcheck:
    for j in wordcheck[i]:
        print j+","+i

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