2 snippets in Python
[expression for item in iterable if condition]prices = [10, 25, 50, 75, 100]
affordable = [p for p in prices if p <= 50]
print(affordable)
squares = [n ** 2 for n in range(1, 6)]
print(squares)[10, 25, 50]
[1, 4, 9, 16, 25]Note Comprehensions are more Pythonic and faster than equivalent for-loop-with-append patterns. Keep them simple; if nesting gets deep, use a regular loop.
[expr for x in iterable if cond]# Transform + filter
temps_f = [32, 68, 95, 104, 50]
warm_c = [(f - 32) * 5 / 9 for f in temps_f if f > 60]
print([round(c, 1) for c in warm_c])
# Nested comprehension (flatten)
matrix = [[1, 2], [3, 4], [5, 6]]
flat = [n for row in matrix for n in row]
print(flat)[20.0, 35.0, 40.0]
[1, 2, 3, 4, 5, 6]Note In nested comprehensions, the outer loop comes first: [x for row in matrix for x in row]. This matches the order of equivalent nested for loops.