def get(self):
user = users.get_current_user()
if user:
nickname = user.nickname()
logout_url = users.create_logout_url('/')
greeting = 'Welcome, {}! (<a href="{}">sign out</a>)'.format(
nickname, logout_url)
else:
login_url = users.create_login_url('/')
greeting = '<a href="{}">Sign in</a>'.format(login_url)
self.response.write(
'<html><body>{}</body></html>'.format(greeting))
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