Re: unsupported operand type(s) for -: 'unicode' and 'int'

[Sam Lai]

I'd say you should check if the pagesize variable is a string or not
on this line -

upperbound=self.pagesize * int(arg0)

Remember in Python, 'hello' * 2 == 'hellohello'.

On 24 December 2010 05:04, prasad iyer  wrote:
> Hi Everyone,
> I am getting type error on integer. I have tried converting all the
> possible variables to int but still the problem persist. Can anyone
> help me out with this type error
> following is the stack trace
> http://dpaste.com/289886/
>
> following are the 2 functions which are giving me the problem
>
> def list_movies(request,page_no=1, orderby=None):
>        try:
>
>                page=int(page_no)
>        except ValueError:
>                page=1
>        if orderby is None:
>                orderby='-date_pub'
>        latest_movies=Movies.objects.all().order_by(orderby)
>        pagination=TubePagination(latest_movies, 20)
>        try:
>                page=int(page)
>                assert (type(page) is IntType)
>                movies=pagination.get_page(page)
>        except InvalidPage:
>                errorcontent='[{"error":"10001"}]'
>                return HttpResponse(content=errorcontent,mimetype='application/
> json')
>        json_serializer=serializers.get_serializer('json')()
>        jsonobj=json_serializer.serialize(movies, ensure_ascii=False)
>        return HttpResponse(content=jsonobj, mimetype="application/json")
>
>
>
>
> class TubePagination:
>        def __init__(self, arg0, arg1=1):
>                self.objs=arg0
>                self.pagesize=arg1
>        def get_page(self, arg0):
>                upperbound=self.pagesize * int(arg0)
>                if upperbound > len(self.objs):
>                        k=upperbound - len(self.objs)
>
>                        if  k > self.pagesize :
>                                raise InvalidPage(arg0)
>                        else:
>                                lowerbound=len(self.objs) - (len(self.objs) % 
> self.pagesize)
>                else:
>                        lowerbound=upperbound-self.pagesize
>                if lowerbound < 0:
>                        lowerbound = 0
>                return self.objs[lowerbound:upperbound]
>
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unsupported operand type(s) for -: 'unicode' and 'int'

[prasad iyer]

Hi Everyone,
I am getting type error on integer. I have tried converting all the
possible variables to int but still the problem persist. Can anyone
help me out with this type error
following is the stack trace
http://dpaste.com/289886/

following are the 2 functions which are giving me the problem

def list_movies(request,page_no=1, orderby=None):
try:

page=int(page_no)
except ValueError:
page=1
if orderby is None:
orderby='-date_pub'
latest_movies=Movies.objects.all().order_by(orderby)
pagination=TubePagination(latest_movies, 20)
try:
page=int(page)
assert (type(page) is IntType)
movies=pagination.get_page(page)
except InvalidPage:
errorcontent='[{"error":"10001"}]'
return HttpResponse(content=errorcontent,mimetype='application/
json')
json_serializer=serializers.get_serializer('json')()
jsonobj=json_serializer.serialize(movies, ensure_ascii=False)
return HttpResponse(content=jsonobj, mimetype="application/json")




class TubePagination:
def __init__(self, arg0, arg1=1):
self.objs=arg0
self.pagesize=arg1
def get_page(self, arg0):
upperbound=self.pagesize * int(arg0)
if upperbound > len(self.objs):
k=upperbound - len(self.objs)

if  k > self.pagesize :
raise InvalidPage(arg0)
else:
lowerbound=len(self.objs) - (len(self.objs) % 
self.pagesize)
else:
lowerbound=upperbound-self.pagesize
if lowerbound < 0:
lowerbound = 0
return self.objs[lowerbound:upperbound]

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