Python中的字典与成员运算符初步探究
发布时间:2020-12-16 21:26:59 所属栏目:Python 来源:网络整理
导读:Python元字典 字典(dictionary)是除列表以外python之中最灵活的内置数据结构类型。列表是有序的对象结合,字典是无序的对象集合。 两者之间的区别在于:字典当中的元素是通过键来存取的,而不是通过偏移存
Python元字典 #!/usr/bin/python # -*- coding: UTF-8 -*- dict = {} dict['one'] = "This is one" dict[2] = "This is two" tinydict = {'name': 'john','code':6734,'dept': 'sales'} print dict['one'] # 输出键为'one' 的值 print dict[2] # 输出键为 2 的值 print tinydict # 输出完整的字典 print tinydict.keys() # 输出所有键 print tinydict.values() # 输出所有值 输出结果为: This is one This is two {'dept': 'sales','code': 6734,'name': 'john'} ['dept','code','name'] ['sales',6734,'john'] Python成员运算符 以下实例演示了Python所有成员运算符的操作: #!/usr/bin/python a = 10 b = 20 list = [1,2,3,4,5 ]; if ( a in list ): print "Line 1 - a is available in the given list" else: print "Line 1 - a is not available in the given list" if ( b not in list ): print "Line 2 - b is not available in the given list" else: print "Line 2 - b is available in the given list" a = 2 if ( a in list ): print "Line 3 - a is available in the given list" else: print "Line 3 - a is not available in the given list" 以上实例输出结果: Line 1 - a is not available in the given list Line 2 - b is not available in the given list Line 3 - a is available in the given list (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |