Python |统计给定文本文件中每个单词的出现次数(使用字典)
原文:https://www . geesforgeks . org/python-给定文本文件中每个单词的出现次数-使用字典/
很多时候需要计算文本文件中每个单词的出现次数。为了实现这一点，我们使用了一个字典对象，它将单词存储为关键字，将其计数存储为相应的值。我们遍历文件中的每个单词，并将其添加到字典中，计数为 1。如果这个词已经存在于字典中，我们就把它的计数增加 1。
示例#1:
首先我们创建一个文本文件，我们要对其进行字数统计。假设该文件为**sample.txt** ，内容如下:
Mango banana apple pear
Banana grapes strawberry
Apple pear mango banana
Kiwi apple mango strawberry
注意:确保文本文件和 Python 文件在同一个目录下。
# Open the file in read mode
text = open("sample.txt", "r")
# Create an empty dictionary
d = dict()
# Loop through each line of the file
for line in text:
# Remove the leading spaces and newline character
line = line.strip()
# Convert the characters in line to
# lowercase to avoid case mismatch
line = line.lower()
# Split the line into words
words = line.split(" ")
# Iterate over each word in line
for word in words:
# Check if the word is already in dictionary
if word in d:
# Increment count of word by 1
d[word] = d[word] + 1
else:
# Add the word to dictionary with count 1
d[word] = 1
# Print the contents of dictionary
for key in list(d.keys()):
print(key, ":", d[key])
输出:
mango : 3
banana : 3
apple : 3
pear : 2
grapes : 1
strawberry : 2
kiwi : 1
例 2:
考虑一个有带标点符号的句子的文件**sample.txt**。
Mango! banana apple pear.
Banana, grapes strawberry.
Apple- pear mango banana.
Kiwi "apple" mango strawberry.
import string
# Open the file in read mode
text = open("sample.txt", "r")
# Create an empty dictionary
d = dict()
# Loop through each line of the file
for line in text:
# Remove the leading spaces and newline character
line = line.strip()
# Convert the characters in line to
# lowercase to avoid case mismatch
line = line.lower()
# Remove the punctuation marks from the line
line = line.translate(line.maketrans("", "", string.punctuation))
# Split the line into words
words = line.split(" ")
# Iterate over each word in line
for word in words:
# Check if the word is already in dictionary
if word in d:
# Increment count of word by 1
d[word] = d[word] + 1
else:
# Add the word to dictionary with count 1
d[word] = 1
# Print the contents of dictionary
for key in list(d.keys()):
print(key, ":", d[key])
输出:
mango : 3
banana : 3
apple : 3
pear : 2
grapes : 1
strawberry : 2
kiwi : 1
版权属于：月萌API www.moonapi.com，转载请注明出处
