How to use the pybit.models.Package function in pybit

def get_packages(self,page=None):
        try:
            cur = self.conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
            if page:
                # CONSTANT
                offset = (page -1) * self.limit_high;
                cur.execute("SELECT id,version,name FROM package ORDER BY name,id LIMIT %s OFFSET %s", (self.limit_high,offset,))
            else:
                cur.execute("SELECT id,version,name FROM package ORDER BY name,id")
            res = cur.fetchall()
            self.conn.commit()

            packages = []
            for i in res:
                packages.append(Package(i['id'],i['version'],i['name']))
            cur.close()
            return packages
        except psycopg2.Error as e:
            self.conn.rollback()
            raise Exception("Error retrieving packages list. Database error code: "  + str(e.pgcode) + " - Details: " + str(e.pgerror))
            return None

def get_package_id(self,package_id):
        try:
            cur = self.conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
            cur.execute("SELECT id,version,name FROM package WHERE id=%s",(package_id,))
            res = cur.fetchall()
            self.conn.commit()
            package = Package(res[0]['id'],res[0]['version'],res[0]['name'])
            cur.close()
            return package
        except psycopg2.Error as e:
            self.conn.rollback()
            raise Exception("Error retrieving package with id:" + str(package_id) + ". Database error code: "  + str(e.pgcode) + " - Details: " + str(e.pgerror))
            return None

def get_packagenames(self):
        try:
            cur = self.conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
            cur.execute("SELECT DISTINCT (name), name FROM package GROUP BY name ORDER BY name") # We only care about a unique list of names
            res = cur.fetchall()
            self.conn.commit()

            packages = []
            for i in res:
                packages.append(Package(None,None,i['name'])) # TODO: these may actually be useful to have still.
            cur.close()
            return packages
        except psycopg2.Error as e:
            self.conn.rollback()
            raise Exception("Error retrieving packages list. Database error code: "  + str(e.pgcode) + " - Details: " + str(e.pgerror))
            return None

def get_package_byvalues(self,name,version):
        try:
            cur = self.conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
            cur.execute("SELECT id,name,version FROM package WHERE name=%s AND version=%s",(name,version))
            res = cur.fetchall()
            self.conn.commit()

            packages = []
            for i in res:
                packages.append(Package(i['id'],i['version'],i['name']))
            cur.close()
            return packages
        except psycopg2.Error as e:
            self.conn.rollback()
            raise Exception("Error retrieving package by values:" + name + version + ". Database error code: "  + str(e.pgcode) + " - Details: " + str(e.pgerror))
            return None

def get_packages_byname(self, name):
        try:
            cur = self.conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
            cur.execute("SELECT id,version,name FROM package WHERE name=%s",(name,))
            res = cur.fetchall()
            self.conn.commit()

            packages = []
            for i in res:
                packages.append(Package(i['id'],i['version'],i['name']))
            cur.close()
            return packages
        except psycopg2.Error as e:
            self.conn.rollback()
            raise Exception("Error retrieving package with name:" + str(name) + ". Database error code: "  + str(e.pgcode) + " - Details: " + str(e.pgerror))
            return None

def put_package(self,version,name):
        try:
            cur = self.conn.cursor(cursor_factory=psycopg2.extras.DictCursor)
            cur.execute("INSERT into package(version,name) VALUES (%s, %s)  RETURNING id",(remove_nasties(version),remove_nasties(name)))
            res = cur.fetchall()
            self.conn.commit()
            package = Package(res[0]['id'],version,name)
            cur.close()
            return package
        except psycopg2.Error as e:
            self.conn.rollback()
            raise Exception("Error adding package:" + name + version + ". Database error code: "  + str(e.pgcode) + " - Details: " + str(e.pgerror))
            return None