word_count.py

import csv

with open('cancel.csv') as f:
    reader = csv.DictReader(f)

    words = {}
    for row in reader:
        reason = row['Reason']
        if reason == 'System cancelled - non payment':
            continue
       
        for word in reason.split(' '):
            word = word.lower()
            if word in ['it', 'to', 'the', 'for', 'this', 'and', 'a', 'my']:
                continue
            words.setdefault(word, 0)
            words[word] += 1

locked = list(words.items())
locked.sort(key=lambda x: x[1], reverse=True)

for word, count in locked[:50]:
    print(word, count)