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Python: Calculate the sum of the positive and negative numbers of a given list of numbers using lambda function

Python Lambda: Exercise-23 with Solution

Write a Python program to calculate the sum of the positive and negative numbers of a given list of numbers using lambda function.

Sample Solution:

Python Code :

nums = [2, 4, -6, -9, 11, -12, 14, -5, 17]
print("Original list:",nums)

total_negative_nums = list(filter(lambda nums:nums<0,nums))
total_positive_nums = list(filter(lambda nums:nums>0,nums))

print("Sum of the positive numbers: ",sum(total_negative_nums))
print("Sum of the negative numbers: ",sum(total_positive_nums))

Sample Output:

Original list: [2, 4, -6, -9, 11, -12, 14, -5, 17]
Sum of the positive numbers:  -32
Sum of the negative numbers:  48

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Previous: Write a Python program that sum the length of the names of a given list of names after removing the names that starts with an lowercase letter. Use lambda function.
Next: Write a Python program to find numbers within a given range where every number is divisible by every digit it contains.

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Python: Tips of the Day

Python: Cache results with decorators

There is a great way to cache functions with decorators in Python. Caching will help save time and precious resources when there is an expensive function at hand.

Implementation is easy, just import lru_cache from functools library and decorate your function using @lru_cache.

from functools import lru_cache

@lru_cache(maxsize=None)
def fibo(a):
    if a <= 1:
        return a
    else:
        return fibo(a-1) + fibo(a-2)

for i in range(20):
    print(fibo(i), end="|")

print("\n\n", fibo.cache_info())

Output:

0|1|1|2|3|5|8|13|21|34|55|89|144|233|377|610|987|1597|2584|4181|

 CacheInfo(hits=36, misses=20, maxsize=None, currsize=20)