html - Name of the user not getting displayed in python code -

i have made signup page using python. following link code :

as user signs up, should redirected /welcome says :

welcome user

but cannot display above mentioned code.

whereas when write

self.redirect('/welcome?username = '+user)

i redirected page says

welcome user

why so?

when write:

self.redirect('/welcome?username=' + user) #no whitespaces in url

you adding url parameter(of type name=value), in case username=user. so, when welcomehandler class handles request:

username=self.request.get('username')

it sets username value of parameter in url name 'username' (username = user) , welcome message correctly displayed. if you:

self.redirect('/welcome')

there no parameters in url , username set default empty string , welcome displayed.

check here request documentation.

TSQL