Python List Comprehension

[
    planet.upper() + '!' 
    for planet in planets 
    if len(planet) < 6
]

tek satır hali

def count_negatives(nums):
    return len([num for num in nums if num < 0])
print(count_negatives([5, -1, -2, 0, 3]))

boolean kullanımı

def count_negatives(nums):
    # Reminder: in the "booleans and conditionals" exercises, we learned about a quirk of 
    # Python where it calculates something like True + True + False + True to be equal to 3.
    return sum([num < 0 for num in nums])