python怎么比较字符串是否相等

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)