[py3] Prepared MySQL backend for Python 3 compatibility

django/db/backends/mysql/compiler.py

@@ -1,10 +1,16 @@
+try:
+    from itertools import zip_longest
+except ImportError:
+    from itertools import izip_longest as zip_longest
+
 from django.db.models.sql import compiler
 
+
 class SQLCompiler(compiler.SQLCompiler):
     def resolve_columns(self, row, fields=()):
         values = []
         index_extra_select = len(self.query.extra_select)
-        for value, field in map(None, row[index_extra_select:], fields):
+        for value, field in zip_longest(row[index_extra_select:], fields):
             if (field and field.get_internal_type() in ("BooleanField", "NullBooleanField") and
                 value in (0, 1)):
                 value = bool(value)

django/db/backends/mysql/introspection.py

@@ -1,8 +1,9 @@
+import re
+from .base import FIELD_TYPE
+
 from django.db.backends import BaseDatabaseIntrospection
 from django.utils import six
-from MySQLdb import ProgrammingError, OperationalError
-from MySQLdb.constants import FIELD_TYPE
-import re
+
 
 foreign_key_re = re.compile(r"\sCONSTRAINT `[^`]*` FOREIGN KEY \(`([^`]*)`\) REFERENCES `([^`]*)` \(`([^`]*)`\)")