Fixed #21302 -- Fixed unused imports and import *.

django/forms/__init__.py

@@ -2,8 +2,8 @@
 Django validation and HTML form handling.
 """
 
-from django.core.exceptions import ValidationError
-from django.forms.fields import *
-from django.forms.forms import *
-from django.forms.models import *
-from django.forms.widgets import *
+from django.core.exceptions import ValidationError  # NOQA
+from django.forms.fields import *  # NOQA
+from django.forms.forms import *  # NOQA
+from django.forms.models import *  # NOQA
+from django.forms.widgets import *  # NOQA

django/forms/extras/__init__.py

@@ -1 +1,3 @@
-from django.forms.extras.widgets import *
+from django.forms.extras.widgets import SelectDateWidget
+
+__all__ = ['SelectDateWidget']

django/forms/fields.py

@@ -30,7 +30,7 @@ from django.utils.six.moves.urllib.parse import urlsplit, urlunsplit
 from django.utils.translation import ugettext_lazy as _, ungettext_lazy
 
 # Provide this import for backwards compatibility.
-from django.core.validators import EMPTY_VALUES
+from django.core.validators import EMPTY_VALUES  # NOQA
 
 
 __all__ = (

django/forms/widgets.py

@@ -15,7 +15,7 @@ from django.utils.html import conditional_escape, format_html
 from django.utils.translation import ugettext_lazy
 from django.utils.encoding import force_text, python_2_unicode_compatible
 from django.utils.safestring import mark_safe
-from django.utils import datetime_safe, formats, six
+from django.utils import formats, six
 from django.utils.six.moves.urllib.parse import urljoin
 
 __all__ = (