# In django/core/serializers/python.py add these two lines to the handle_field method:

if isinstance(field, models.BooleanField) and isinstance(self._current[field.name], int):
    self._current[field.name] = bool(self._current[field.name])

# Original method

     def handle_field(self, obj, field):
         self._current[field.name] = getattr(obj, field.name)


# Modified method

     def handle_field(self, obj, field):
         self._current[field.name] = getattr(obj, field.name)
         if isinstance(field, models.BooleanField) and isinstance(self._current[field.name], int):
             self._current[field.name] = bool(self._current[field.name])