List Comprehension: Compact List Building

why use list comprehension

• Fewer lines than traditional loops
• Easier to read once you get familiar
• Often more efficient for simple operations

example generate squares

using a loop

squares = []
for i in range(1, 6):
    squares.append(i * i)
print(squares)

using comprehension

squares = [i * i for i in range(1, 6)]
print(squares)

[1, 4, 9, 16, 25]

with conditions

evens = [i for i in range(10) if i % 2 == 0]
print(evens)

[0, 2, 4, 6, 8]

conclusion

Comprehensions are useful when they keep the transformation simple and obvious. Prefer loops if the logic grows complex.