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Python – Count occurrences of each word in given text file

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  • Difficulty Level : Medium
  • Last Updated : 25 Aug, 2022
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Many times it is required to count the occurrence of each word in a text file. To achieve so, we make use of a dictionary object that stores the word as the key and its count as the corresponding value. We iterate through each word in the file and add it to the dictionary with a count of 1. If the word is already present in the dictionary we increment its count by 1. 

File sample.txt

First, we create a text file in which we want to count the words in Python. Let this file be sample.txt with the following contents

Mango banana apple pear
Banana grapes strawberry
Apple pear mango banana
Kiwi apple mango strawberry

Example 1: Count occurrences of each word in a given text file

Here, we use a Python loop to read each line, and from that line, we are converting each line to lower for the unique count and then split each word to count its number.

Python3




# 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])


Output:

mango : 3
banana : 3
apple : 3
pear : 2
grapes : 1
strawberry : 2
kiwi : 1

Example 2: Count occurrences of specific words in a given text file

In this example, we will count the number of “apples” present in the text file.

Python3




word = "apple"
count = 0
with open("temp.txt", 'r') as f:
    for line in f:
        words = line.split()
        for i in words:
            if(i==word):
                count=count+1
print("Occurrences of the word", word, ":", count)


Output:

Occurrences of the word apple: 2

Example 3: Count total occurrences of words in a given text file

In this example, we will count the total number of words present in a text file.

Python3




count = 0
  
# Opens a file in read mode
f = open("sample.txt", "r")
  
# Gets each line till end
for line in f:
    # Splits into words
    word = line.split(" ")
    # Counts each words
    count += len(word)
  
print("Total Number of Words: " + str(count))
f.close()


Output:

Total Number of Words: 15

Consider the files with punctuation

Sample.txt:

Mango! banana apple pear.
Banana, grapes strawberry.
Apple- pear mango banana.
Kiwi "apple" mango strawberry.

Code:

Python3




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])


Output:

mango : 3
banana : 3
apple : 3
pear : 2
grapes : 1
strawberry : 2
kiwi : 1

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