摘要:
python的set和其他语言类似, 是一个无序不重复元素集, 基本功能包括关系测试和消除重复元素. 集合对象还支持union(联合), intersection(交), difference(差)和sysmmetric difference(对称差集)等数学运算. sets 支持 x in set 阅读全文
摘要:
Python’s with statement provides a very convenient way of dealing with the situation where you have to do a setup and teardown to make something happe... 阅读全文