Python: Count the occurrences of the items in a given list using lambda

Last update on April 22 2025 12:55:37 (UTC/GMT +8 hours)

49. Count Occurrences Lambda

Write a Python program to count the occurrences of items in a given list using lambda.

Sample Solution:

Python Code :

# Define a function 'count_occurrences' that counts occurrences of each item in a list
def count_occurrences(nums):
    # Convert 'nums' to a list and map each element to a tuple containing the element and its count in 'nums'
    # Use the 'dict' function to convert the mapped result to a dictionary
    result = dict(map(lambda el: (el, list(nums).count(el)), nums))
    
    # Return the dictionary containing the count of occurrences of each item
    return result

# Create a list 'nums' containing integer values
nums = [3, 4, 5, 8, 0, 3, 8, 5, 0, 3, 1, 5, 2, 3, 4, 2]

# Print the original list 'nums'
print("Original list:")
print(nums)

# Count the occurrences of items in the list using the 'count_occurrences' function and print the result
print("\nCount the occurrences of the items in the said list:")
print(count_occurrences(nums)) 

Sample Output:

Original list:
[3, 4, 5, 8, 0, 3, 8, 5, 0, 3, 1, 5, 2, 3, 4, 2]

Count the occurrences of the items in the said list:
{3: 4, 4: 2, 5: 3, 8: 2, 0: 2, 1: 1, 2: 2}

For more Practice: Solve these Related Problems:

• Write a Python program to count the occurrences of each character in a string using lambda.
• Write a Python program to count the occurrences of each word in a list using lambda.
• Write a Python program to count the frequency of even and odd numbers separately in a list using lambda.
• Write a Python program to count the occurrences of items in a list and return a dictionary sorted by frequency using lambda.

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