Removed some outdated backwards compatibility imports and misleading comments.

EmptyResultSet moved in 46509cf13d.
FieldDoesNotExist moved in 8958170755.
BoundField and pretty_name moved in 8550161e53.
EMPTY_VALUES moved in 471596fc1a.
BaseRunserverCommand moved in 5c53e30607.

django/forms/fields.py

@@ -15,8 +15,6 @@ from urllib.parse import urlsplit, urlunsplit
 
 from django.core import validators
 from django.core.exceptions import ValidationError
-# Provide this import for backwards compatibility.
-from django.core.validators import EMPTY_VALUES  # NOQA
 from django.forms.boundfield import BoundField
 from django.forms.utils import from_current_timezone, to_current_timezone
 from django.forms.widgets import (

django/forms/forms.py

@@ -5,11 +5,8 @@ Form classes
 import copy
 
 from django.core.exceptions import NON_FIELD_ERRORS, ValidationError
-# BoundField is imported for backwards compatibility in Django 1.9
-from django.forms.boundfield import BoundField  # NOQA
 from django.forms.fields import Field, FileField
-# pretty_name is imported for backwards compatibility in Django 1.9
-from django.forms.utils import ErrorDict, ErrorList, pretty_name  # NOQA
+from django.forms.utils import ErrorDict, ErrorList
 from django.forms.widgets import Media, MediaDefiningClass
 from django.utils.datastructures import MultiValueDict
 from django.utils.functional import cached_property

django/forms/utils.py

@@ -2,7 +2,7 @@ import json
 from collections import UserList
 
 from django.conf import settings
-from django.core.exceptions import ValidationError  # backwards compatibility
+from django.core.exceptions import ValidationError
 from django.utils import timezone
 from django.utils.html import escape, format_html, format_html_join, html_safe
 from django.utils.translation import gettext_lazy as _