Source : Dan at Real Python info@realpython.com
# Python's list comprehensions are awesome. vals = [expression for value in collection if condition] # This is equivalent to: vals = [] for value in collection: if condition: vals.append(expression) # Example: >>> even_squares = [x * x for x in range(10) if not x % 2] >>> even_squares [0, 4, 16, 36, 64]