Day 85: Python Program to Count the Occurrences of Each Word in a String

 

def count_word_occurrences(input_string):

    words = input_string.split()

    word_count = {}

    for word in words:

        word = word.lower()

        if word in word_count:

            word_count[word] += 1

        else:

            word_count[word] = 1

    return word_count

input_string = input("Enter a string: ")

result = count_word_occurrences(input_string)

print("\nWord occurrences:")

for word, count in result.items():

    print(f"{word}: {count}")

#source code --> clcoding.com 

Code Explanation:

1. Function Definition

def count_word_occurrences(input_string):

The function count_word_occurrences is defined to perform the task of counting words.

It takes one parameter, input_string, which is the string where word occurrences are counted.

2. Splitting the String into Words

words = input_string.split()

The input string is split into a list of words using the split() method.

By default, this splits the string at spaces and removes extra spaces.

3. Initializing an Empty Dictionary

word_count = {}

A dictionary word_count is initialized to store words as keys and their counts as values.

4. Iterating Over Words

for word in words:

    word = word.lower()

    if word in word_count:

        word_count[word] += 1

    else:

        word_count[word] = 1

The loop iterates through each word in the list words.

Step-by-step:

Convert to Lowercase:

word = word.lower()

This ensures the count is case-insensitive (e.g., "Hello" and "hello" are treated as the same word).

Check if Word is in Dictionary:

If the word already exists as a key in word_count, increment its count by 1:

word_count[word] += 1

If the word is not in the dictionary, add it with an initial count of 1:

word_count[word] = 1

After the loop:

word_count = {"hello": 2, "world!": 1}

5. Returning the Result

return word_count

The dictionary word_count is returned, containing each word as a key and its count as the value.

6. Getting User Input

input_string = input("Enter a string: ")

The program prompts the user to enter a string. The input is stored in input_string.

7. Calling the Function and Displaying Results

result = count_word_occurrences(input_string)

print("\nWord occurrences:")

for word, count in result.items():

    print(f"{word}: {count}")

The count_word_occurrences function is called with the user’s input, and the result is stored in result.

The program iterates through the dictionary result and prints each word along with its count.