<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_collection(self, folderid, username="", offset=0, limit=10):
 """Fetch collection folder contents :param folderid: UUID of the folder to list :param username: The user to list folders for, if omitted the authenticated user is used :param offset: the pagination offset :param limit: the pagination limit """


        if not username and self.standard_grant_type == "authorization_code":
            response = self._req('/collections/{}'.format(folderid), {
                "offset":offset,
                "limit":limit
            })
        else:
            if not username:
                raise DeviantartError("No username defined.")
            else:
                response = self._req('/collections/{}'.format(folderid), {
                    "username":username,
                    "offset":offset,
                    "limit":limit
                })

        deviations = []

        for item in response['results']:
            d = Deviation()
            d.from_dict(item)
            deviations.append(d)

        if "name" in response:
            name = response['name']
        else:
            name = None

        return {
            "results" : deviations,
            "name" : name,
            "has_more" : response['has_more'],
            "next_offset" : response['next_offset']
        }