Use list comprehensions instead of regular loops when you can.
Old way:
squares = []
for i in range(10):
squares.append(i**2)
Pythonic way: squares = [i**2 for i in range(10)]
Same result. Cleaner code. More readable. Faster execution. Pro engineers don't write more code — they write less, smarter code. Drop your favorite Python tip — we're building a community cheat sheet.