摘要:
有时候我们需要初始化一个嵌套着几个列表的列表,这种情况下推荐使用列表推导式 代码1: def test01(): l = [["_"] * 3 for i in range(3)] print(l) l[1][2] = "x" print(l) if __name__ == '__main__': 阅读全文
摘要:
import collections from random import choice Card = collections.namedtuple('Card',['rank','suit']) class FrenchDeck: ranks = [str(n) for n in range(2, 阅读全文
摘要:
测试代码如下 from timeit import Timer def fun1(): a = [] for i in range(10000): li = [i] a = a + li def fun2(): a = [i for i in range(10000)] def fun3(): a 阅读全文