Python 列表推导式简单使用

无条件列表推导式

li = [] for i in range(5): li.append(i) print(li) # [0, 1, 2, 3, 4] li2 = [i for i in range(5)] print(li2) # # [0, 1, 2, 3, 4]

有条件子句的列表推导式

li = [] for i in range(5): if i % 2 == 0: li.append(i) print(li) # [0, 2, 4] li2 = [i for i in range(5) if i % 2 == 0] print(li2) [0, 2, 4]

嵌套循环的列表推导式

li = [] for a in range(3): for b in range(2): li.append((a, b)) print(li) # [(0, 0), (0, 1), (1, 0), (1, 1), (2, 0), (2, 1)] li2 = [(a, b) for a in range(3) for b in range(2)] print(li2) # [(0, 0), (0, 1), (1, 0), (1, 1), (2, 0), (2, 1)]