大写字母单词计数python

Question

Right now my code prints how many times every word is used in the txt file. I'm trying to get it to ONLY print the top 3 words used with capital letters within the txt file...

file=open("novel.txt","r+")
wordcount={}
for word in file.read().split():
    if word not in wordcount:
        wordcount[word] = 1
    else:
        wordcount[word] += 1
for a,b in wordcount.items():
    print (b, a)

Answer 1

First you want to limit your result to only capitalized words using str.istitle() :

file=open("novel.txt","r+")
wordcount={}
for word in file.read().split():
    if word.istitle():
        if word not in wordcount:
            wordcount[word] = 1
        else:
            wordcount[word] += 1
for a,b in wordcount.items():
    print (b, a)

Then sort the results using sorted() and print out the first three:

file=open("novel.txt","r+")
wordcount={}
for word in file.read().split():
    if word.istitle():
        if word not in wordcount:
            wordcount[word] = 1
        else:
            wordcount[word] += 1

items = sorted(wordcount.items(), key=lambda tup: tup[1], reverse=True) 

for item in items[:3]:
    print item[0], item[1]

Answer 2

In Collections there's a Counter class. https://docs.python.org/2/library/collections.html .

cnt = Counter([w for w in file.read().split() if w.lower() != w]).most_common(3)