diff --git a/MySQLdb/MySQLdb/converters.py b/MySQLdb/MySQLdb/converters.py
index da2ed46..307a10c 100644
--- a/MySQLdb/MySQLdb/converters.py
+++ b/MySQLdb/MySQLdb/converters.py
@@ -34,16 +34,20 @@ MySQL.connect().
 
 from _mysql import string_literal, escape_sequence, escape_dict, escape, NULL
 from constants import FIELD_TYPE, FLAG
-from sets import *
+from sets import BaseSet
 from times import *
 import types
 import array
 
+def Bool2Str(s, d): return str(int(s))
 
 def Str2Set(s):
     values = s.split(',')
     return Set(*values)
 
+def Set2Str(s, d):
+    return string_literal(','.join(s), d)
+    
 def Thing2Str(s, d):
     """Convert something into a string via str()."""
     return str(s)
@@ -120,8 +124,10 @@ conversions = {
     types.StringType: Thing2Literal, # default
     types.UnicodeType: Unicode2Str,
     types.ObjectType: Instance2Str,
+    types.BooleanType: Bool2Str,
     DateTimeType: DateTime2literal,
     DateTimeDeltaType: DateTimeDelta2literal,
+    BaseSet: Set2Str,
     FIELD_TYPE.TINY: int,
     FIELD_TYPE.SHORT: int,
     FIELD_TYPE.LONG: long,
@@ -158,9 +164,5 @@ try:
 except ImportError:
     pass
 
-try:
-    from types import BooleanType
-    def Bool2Str(s, d): return str(int(s))
-    conversions[BooleanType] = Bool2Str
-except ImportError:
-    pass
+
+