Python Learning Note 2-tuple

Tuple:

#tuples are also lists, but the values do not changeA= ('123','234','1234')Print(a[1]) MySQL=('127.0.0.1','3306',"'Root','123456')Print(Mysql.count ('Root'))#ExampleAll_user={} whileTrue:username=input ('Username:'). Strip () passwd=input ('passwd:'). Strip () Cpwd=input ('cpwd:'). Strip ()ifUsername andPwd andcpwd:ifUsernameinchAll_user:Print('user name already exists')        Else:            ifpwd==Cpwd:all_user[username]=passwdElse:                Print('two times password inconsistency')    Else:        Print('account password cannot be empty')#Login Examplesall_users={} whileTrue:username=input ('Username:'). Strip () passwd=input ('passwd:'). Strip ()ifUsername andpasswd:ifUsernameinchall_users:passwd=All_users[username]ifpasswd==All_users[username]:Print('Login Successful')               Break           Else:              Print('Password Error')       Else:          Print('user name does not exist')    Else:        Print('The user password cannot be empty')

Python Learning Note 2-tuple