python list生成表達式

列表生成式即List Comprehensions，是Python內置的非常簡單卻強大的可以用來創建list的生成式。運用列表生成式，可以寫出非常簡潔的代碼。

1 >>> list(range(0, 10))
2 [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

1 >>> [x * x for x in range(1, 11)]
2 [1, 4, 9, 16, 25, 36, 49, 64, 81, 100]

1 >>> [x * x for x in range(1, 11) if x % 2 == 0]
2 [4, 16, 36, 64, 100]

1 >>> [m + n for m in 'ABC' for n in 'XYZ']
2 ['AX', 'AY', 'AZ', 'BX', 'BY', 'BZ', 'CX', 'CY', 'CZ']

1 >>> d = {'x': 'A', 'y': 'B', 'z': 'C'}
2 >>> [k + '=' + v for k, v in d.items()]
3 ['x=A', 'y=B', 'z=C']