Fixed #17923 -- Added missing import in the MySQL and Oracle backends. Thanks aldaran for the report. Also removed two duplicate imports.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17758 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/backends/mysql/base.py

@@ -7,6 +7,7 @@ Requires MySQLdb: http://sourceforge.net/projects/mysql-python
 import datetime
 import re
 import sys
+import warnings
 
 try:
     import MySQLdb as Database
@@ -39,8 +40,7 @@ from django.utils import timezone
 # Raise exceptions for database warnings if DEBUG is on
 from django.conf import settings
 if settings.DEBUG:
-    from warnings import filterwarnings
-    filterwarnings("error", category=Database.Warning)
+    warnings.filterwarnings("error", category=Database.Warning)
 
 DatabaseError = Database.DatabaseError
 IntegrityError = Database.IntegrityError

django/db/backends/oracle/base.py

@@ -8,6 +8,7 @@ Requires cx_Oracle: http://cx-oracle.sourceforge.net/
 import datetime
 import decimal
 import sys
+import warnings
 
 
 def _setup_environment(environ):

django/http/__init__.py

@@ -110,7 +110,6 @@ else:
 class CompatCookie(SimpleCookie):
     def __init__(self, *args, **kwargs):
         super(CompatCookie, self).__init__(*args, **kwargs)
-        import warnings
         warnings.warn("CompatCookie is deprecated. Use django.http.SimpleCookie instead.", DeprecationWarning)
 
 from django.conf import settings