self.index = index
self.packer = types[field_type]
self.size = self.packer.size
self.length_field = len_field_name
def pack(self, list, kwargs=None):
self.index = index
self.packer = types[field_type]
self.size = self.packer.size
self.length_field = len_field_name
def pack(self, list, kwargs=None):