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Learn Functional Programming in Python

List Comprehensions Using Conditions

Explore how to create Python lists using comprehensions with conditional statements. Understand filtering elements like excluding negatives before applying functions such as square root. Learn to write readable and efficient code using list comprehensions with conditions.

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Imagine you want to find the square root of every value in a list, but you want to ignore any negative values so that they don’t even appear in the output list. Here is how you might do it with a loop:

Python 3.8
import math
k = [-1, 16, 9, -4, 0, 25]
a = []
for x in k:
  if x>=0:
    a.append(math.sqrt(x))
    
print(a)

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