python - [solved]how to apply strptime(string,format) on StringProperty? -

[solved] mixed class method , instance method before. when

tried call strptime(cls.ts,format) inside @classmethod function , calling

ts = ndb.stringproperty() or stringproperty('ts'),but not string value inside ts.

the correct 1 remove @ decorator , call

strptime(self.ts,format) .

original question below

1:when token instance created , init_created() called inititalize ts string.

2:user request verification handler , token arg , token used retrieve token instance.

3:i use token instance call is_valid() .in is_valid , convert ts datetime obj, compare other datetime obj.

error 1 :

when set( str() method )

delta = (now-datetime.strptime(str(cls.ts),'%y-%b-%d / %h:%m:%s:%f')).total_seconds() 

i get

valueerror: time data "stringproperty('ts')" not match format '%y-%b-%d / %h:%m:%s:%f' 

error 2 : try way. set (without str() )

delta = (now-datetime.strptime(cls.ts,'%y-%b-%d / %h:%m:%s:%f')).total_seconds() 

i get

typeerror: must string, not stringproperty 

so question how correctly pass stringproperty strptime method.

thank .

below code:

class token(ndb.model):      ts = ndb.stringproperty()       @classmethod      def init_created(cls):           ts = (datetime.utcnow() + timedelta(hours=8)).strftime(format='%y-%b-%d / %h:%m:%s:%f')           return ts      @classmethod      def is_valid(cls):           = (datetime.utcnow() + timedelta(hours=8))           delta = (now-datetime.strptime(cls.ts,'%y-%b-%d / %h:%m:%s:%f')).total_seconds()           return (delta<expire_time)   class verification(webapp2.requesthandler):      def get(self , token ):          token_cls = token.query(token.token == token ).get()          if not (token_cls , token_cls.is_valid() ) :               template = jinja_environment.get_template('verification_error.html' )               pass       must string, not stringproperty traceback (most recent call last):   file "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1536, in __call__     rv = self.handle_exception(request, response, e)   file "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1530, in __call__     rv = self.router.dispatch(request, response)   file "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1278, in default_dispatcher     return route.handler_adapter(request, response)   file "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 1102, in __call__     return handler.dispatch()   file "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 572, in dispatch     return self.handle_exception(e, self.app.debug)   file "/base/data/home/runtimes/python27/python27_lib/versions/third_party/webapp2-2.5.1/webapp2.py", line 570, in dispatch     return method(*args, **kwargs)   file "/base/data/home/apps/s/1.374948928179626607/main.py", line 216, in     if not (token_cls , token_cls.is_valid() ) :   file "/base/data/home/apps/s~/1.374948928179626607/main.py", line 86, in is_valid     delta = (now-datetime.strptime(cls.ts,'%y-%b-%d / %h:%m:%s:%f')).total_seconds() typeerror: must string, not stringproperty 

your is_valid method shouldn't have @classmethod decorator, you're operating on token class, , not on entity returned query. once you've removed decorator, idiomatic change cls self.