def deserialize_file_header(self, fd):
r"""Deserialize the header information from the file and update the
serializer.
Args:
fd (file): File containing header.
"""
fd.seek(0)
serialize.discover_header(fd, self, newline=self.newline,
comment=self.comment, delimiter=self.delimiter)
def read_header(self):
r"""Read header lines from the file and update serializer info."""
if self.header_was_read:
return
pos = self.record_position()
self.change_position(0)
serialize.discover_header(self.fd,
self.serializer,
newline=self.newline,
comment=self.comment,
delimiter=self.delimiter)
self.change_position(*pos)
self.header_was_read = True