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

Python Lambda: Exercise-49 with Solution

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

Sample Solution:

Python Code :

def count_occurrences(nums):
    result = dict(map(lambda el  : (el, list(nums).count(el)), nums))
    return result
nums = [3,4,5,8,0,3,8,5,0,3,1,5,2,3,4,2]
print("Original list:")
print(nums)
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}

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Python: Tips of the Day

Memoization using LRU cache:

import functools

@functools.lru_cache(maxsize=128)
def fibonacci(n):
    if n == 0:
        return 0
    elif n == 1:
        return 1
    return fibonacci(n - 1) + fibonacci(n - 2)