Python 一个打开文本文件的程序，计算单词的数量并报告按它们在文件中出现的次数排序的前 N 个单词？
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A program that opens a text file, counts the number of words and reports the top N words ordered by the number of times they appear in the file?
提问by kmz
Hi all im a beginner at programming, i was recently given the task of creating this program and i am finding it difficult. I have previously designed a program that calculates the number of words in a sentence that are typed in by the user, is it possible to modify this program to achieve what i want?
大家好，我是编程初学者，我最近接到了创建这个程序的任务，但我发现这很困难。我之前设计了一个程序来计算用户输入的句子中的单词数，是否可以修改这个程序来实现我想要的？
import string
def main():
print "This program calculates the number of words in a sentence"
print
p = raw_input("Enter a sentence: ")
words = string.split(p)
wordCount = len(words)
print "The total word count is:", wordCount
main()
采纳答案by Ashwini Chaudhary
Use collections.Counterfor counting words and open()for opening the file:
使用collections.Counter计数的单词和开放（）打开文件：
from collections import Counter
def main():
#use open() for opening file.
#Always use `with` statement as it'll automatically close the file for you.
with open(r'C:\Data\test.txt') as f:
#create a list of all words fetched from the file using a list comprehension
words = [word for line in f for word in line.split()]
print "The total word count is:", len(words)
#now use collections.Counter
c = Counter(words)
for word, count in c.most_common():
print word, count
main()
collections.Counterexample:
collections.Counter例子：
>>> from collections import Counter
>>> c = Counter('aaaaabbbdddeeegggg')
Counter.most_commonreturns words in sorted order based on their count:
Counter.most_common根据字数按排序顺序返回字词：
>>> for word, count in c.most_common():
... print word,count
...
a 5
g 4
b 3
e 3
d 3
回答by jh314
To open files, you can use the openfunction
要打开文件，您可以使用open函数
from collections import Counter
with open('input.txt', 'r') as f:
p = f.read() # p contains contents of entire file
# logic to compute word counts follows here...
words = p.split()
wordCount = len(words)
print "The total word count is:", wordCount
# you want the top N words, so grab it as input
N = int(raw_input("How many words do you want?"))
c = Counter(words)
for w, count in c.most_common(N):
print w, count
回答by NIlesh Sharma
import re
from collections import Counter
with open('file_name.txt') as f:
sentence = f.read()
words = re.findall(r'\w+', sentence)
word_counts = Counter(words)
回答by Injamul Islam
If anyone else is getting the error message for input, you may like to try this one,
如果其他人收到输入错误消息，您可能想尝试这个，
Code:
代码：
N = int(input("\nHow many words do you want: "))
