在实际的开发工作中，经常会遇到要判定两个字符串是否相等，下面我们说一下具体的实现方法
第一种是is来判断
groupName = params['groupName'] ##groupName的值是'url'
reqBody['dim'] = groupName
print("reqBody_dim-SummaryListHandler", reqBody['dim']) ## ('reqBody_dim-SummaryListHandler', u'url')
print("reqBody_dim_url-SummaryListHandler", ('url' is reqBody['dim'])) ## ('reqBody_dim_url-SummaryList
Handler', False)
if groupName is 'url':
打印如下，看到通过is判断是false
('reqBody_dim-SummaryListHandler', u'url')
('reqBody_dim_url-SummaryListHandler', False)第二种是用id 和 in
看到用in可以判断两个字符串相等
print("groupName:",groupName)
reqBody['dim'] = groupName
print("reqBody_dim-SummaryListHandler", reqBody['dim'])
print("reqBody_dim_url_is-SummaryListHandler", ('url' is groupName))
print("reqBody_dim_url_id-SummaryListHandler", (id('url')==id(groupName)))
print("reqBody_dim_url_in-SummaryListHandler", ('url' in groupName))
('groupName:', u'url')
('reqBody_dim-SummaryListHandler', u'url')
('reqBody_dim_url_is-SummaryListHandler', False)
('reqBody_dim_url_id-SummaryListHandler', False)
('reqBody_dim_url_in-SummaryListHandler', True)