Fix and test for bug #764548:

Use isinstance() instead of comparing types directly, to enable
subclasses of str and unicode to be used as patterns.
Blessed by /F.

1 files changed, 2 insertions, 2 deletions

diff --git a/Lib/sre.py b/Lib/sre.py
index 7e107a68fd..7910c83eac 100644
--- a/Lib/sre.py
+++ b/Lib/sre.py
@@ -219,9 +219,9 @@ def _compile(*key):
     if p is not None:
         return p
     pattern, flags = key
-    if type(pattern) is _pattern_type:
+    if isinstance(pattern, _pattern_type):
         return pattern
-    if type(pattern) not in sre_compile.STRING_TYPES:
+    if not isinstance(pattern, sre_compile.STRING_TYPES):
         raise TypeError, "first argument must be string or compiled pattern"
     try:
         p = sre_compile.compile(pattern, flags)