分类：全部列表
mapmap(function,iterable)x=[1,2,3,4,5]defsquare(num):returnnum*numprint(list(map(square,x)))#output:[1,4,9,16,25]lambdalambdax:x=[1,2,3,4,5]print(list(map(lambdanum:num*num,x)))#output:[1,4,9,16,25]listcomprehensions[funtionforiteminiterable]print([num*numfornumin[1,2,3,4,5]])#output:[1,4,9,16,25]补充：Python中求数字的平方根和平方的几种方法方法一：使用内置模块>>>im...
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集合set是一个无序不重复元素的集set(['hello','hello','hi'])#{'hello','hi'}set('hellohellohi')#{'','e','h','i','l','o'}set.add()与set.update()的区别myset1=set()myset1.add('hello')#{'hello'}myset1.update('world')#{'d','hello','l','o','r','w'}myset2=set()myset2.add('123')myset2.update('123')#{'1','123','2','3'}补充：在python中的set操作中添加vs更新如果我只想在集合中添加单个值,那...
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