本文實(shí)例講述了Python統(tǒng)計(jì)純文本文件中英文單詞出現(xiàn)個(gè)數(shù)的方法。分享給大家供大家參考，具體如下：

第一版: 效率低

# -*- coding:utf-8 -*-
#!python3
path = 'test.txt'
with open(path,encoding='utf-8',newline='') as f:
  word = []
  words_dict= {}
  for letter in f.read():
    if letter.isalnum():
      word.append(letter)
    elif letter.isspace(): #空白字符 空格 \t \n
      if word:
        word = ''.join(word).lower() #轉(zhuǎn)小寫(xiě)
        if word not in words_dict:
          words_dict[word] = 1
        else:
          words_dict[word] += 1
        word = []
#處理最后一個(gè)單詞
if word:
  word = ''.join(word).lower() # 轉(zhuǎn)小寫(xiě)
  if word not in words_dict:
    words_dict[word] = 1
  else:
    words_dict[word] += 1
  word = []
for k,v in words_dict.items():
  print(k,v)

運(yùn)行結(jié)果：

we 4
are 1
busy 1
all 1
day 1
like 1
swarms 1
of 6
flies 1
without 1
souls 1
noisy 1
restless 1
unable 1
to 1
hear 1
the 7
voices 1
soul 1
as 1
time 1
goes 1
by 1
childhood 1
away 2
grew 1
up 1
years 1
a 1
lot 1
memories 1
once 1
have 2
also 1
eroded 1
bottom 1
childish 1
innocence 1
regardless 1
shackles 1
mind 1
indulge 1
in 1
world 1
buckish 1
focus 1
on 1
beneficial 1
principle 1
lost 1
themselves 1

第二版:

缺點(diǎn):遇到大文件要一次讀入內(nèi)存，性能不好

# -*- coding:utf-8 -*-
#!python3
import re
path = 'test.txt'
with open(path,'r',encoding='utf-8') as f:
  data = f.read()
  word_reg = re.compile(r'\w+')
  #word_reg = re.compile(r'\w+\b')
  word_list = word_reg.findall(data)
  word_list = [word.lower() for word in word_list] #轉(zhuǎn)小寫(xiě)
  word_set = set(word_list) #避免重復(fù)查詢(xún)
  # words_dict = {}
  # for word in word_set:
  #   words_dict[word] = word_list.count(word)
  # 簡(jiǎn)潔寫(xiě)法
  words_dict = {word: word_list.count(word) for word in word_set}
  for k,v in words_dict.items():
    print(k,v)

運(yùn)行結(jié)果：

on 1
also 1
souls 1
focus 1
soul 1
time 1
noisy 1
grew 1
lot 1
childish 1
like 1
voices 1
indulge 1
swarms 1
buckish 1
restless 1
we 4
hear 1
childhood 1
as 1
world 1
themselves 1
are 1
bottom 1
memories 1
the 7
of 6
flies 1
without 1
have 2
day 1
busy 1
to 1
eroded 1
regardless 1
unable 1
innocence 1
up 1
a 1
in 1
mind 1
goes 1
by 1
lost 1
principle 1
once 1
away 2
years 1
beneficial 1
all 1
shackles 1

第三版:

# -*- coding:utf-8 -*-
#!python3
import re
path = 'test.txt'
with open(path, 'r', encoding='utf-8') as f:
  word_list = []
  word_reg = re.compile(r'\w+')
  for line in f:
    #line_words = word_reg.findall(line)
    #比上面的正則更加簡(jiǎn)單
    line_words = line.split()
    word_list.extend(line_words)
  word_set = set(word_list) # 避免重復(fù)查詢(xún)
  words_dict = {word: word_list.count(word) for word in word_set}
  for k, v in words_dict.items():
    print(k, v)

運(yùn)行結(jié)果：

childhood 1
innocence, 1
are 1
of 6
also 1
lost 1
We 1
regardless 1
noisy, 1
by, 1
on 1
themselves. 1
grew 1
lot 1
bottom 1
buckish, 1
time 1
childish 1
voices 1
once 1
restless, 1
shackles 1
world 1
eroded 1
As 1
all 1
day, 1
swarms 1
we 3
soul. 1
memories, 1
in 1
without 1
like 1
beneficial 1
up, 1
unable 1
away 1
flies 1
goes 1
a 1
have 2
away, 1
mind, 1
focus 1
principle, 1
hear 1
to 1
the 7
years 1
busy 1
souls, 1
indulge 1

第四版:使用Counter統(tǒng)計(jì)

# -*- coding:utf-8 -*-
#!python3
import collections
import re
path = 'test.txt'
with open(path, 'r', encoding='utf-8') as f:
  word_list = []
  word_reg = re.compile(r'\w+')
  for line in f:
    line_words = line.split()
    word_list.extend(line_words)
  words_dict = dict(collections.Counter(word_list)) #使用Counter統(tǒng)計(jì)
  for k, v in words_dict.items():
    print(k, v)

運(yùn)行結(jié)果：

We 1
are 1
busy 1
all 1
day, 1
like 1
swarms 1
of 6
flies 1
without 1
souls, 1
noisy, 1
restless, 1
unable 1
to 1
hear 1
the 7
voices 1
soul. 1
As 1
time 1
goes 1
by, 1
childhood 1
away, 1
we 3
grew 1
up, 1
years 1
away 1
a 1
lot 1
memories, 1
once 1
have 2
also 1
eroded 1
bottom 1
childish 1
innocence, 1
regardless 1
shackles 1
mind, 1
indulge 1
in 1
world 1
buckish, 1
focus 1
on 1
beneficial 1
principle, 1
lost 1
themselves. 1

注：這里使用的測(cè)試文本test.txt如下：

We are busy all day, like swarms of flies without souls, noisy, restless, unable to hear the voices of the soul. As time goes by, childhood away, we grew up, years away a lot of memories, once have also eroded the bottom of the childish innocence, we regardless of the shackles of mind, indulge in the world buckish, focus on the beneficial principle, we have lost themselves.

PS：這里再為大家推薦2款相關(guān)統(tǒng)計(jì)工具供大家參考：

在線字?jǐn)?shù)統(tǒng)計(jì)工具：
http://tools.jb51.net/code/zishutongji

在線字符統(tǒng)計(jì)與編輯工具：
http://tools.jb51.net/code/char_tongji

更多關(guān)于Python相關(guān)內(nèi)容感興趣的讀者可查看本站專(zhuān)題：《Python文件與目錄操作技巧匯總》、《Python文本文件操作技巧匯總》、《Python數(shù)據(jù)結(jié)構(gòu)與算法教程》、《Python函數(shù)使用技巧總結(jié)》、《Python字符串操作技巧匯總》及《Python入門(mén)與進(jìn)階經(jīng)典教程》

希望本文所述對(duì)大家Python程序設(shè)計(jì)有所幫助。

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