diff --git a/src/api/python/z3.py b/src/api/python/z3.py
index ce1cc2103..b46f5a9ef 100644
--- a/src/api/python/z3.py
+++ b/src/api/python/z3.py
@@ -32,7 +32,7 @@ sat
 Z3 exceptions:
 
 >>> try:
-...   x = Int('x')
+...   x = BitVec('x', 32)
 ...   y = Bool('y')
 ...   # the expression x + y is type incorrect
 ...   n = x + y
@@ -1228,6 +1228,16 @@ class BoolSortRef(SortRef):
             _z3_assert(self.eq(val.sort()), "Value cannot be converted into a Z3 Boolean value")
         return val
 
+    def subsort(self, other):
+        return isinstance(other, ArithSortRef)
+
+    def is_int(self):
+        return True
+
+    def is_bool(self):
+        return True
+
+
 class BoolRef(ExprRef):
     """All Boolean expressions are instances of this class."""
     def sort(self):
@@ -1900,6 +1910,10 @@ class ArithSortRef(SortRef):
                 return val
             if val_s.is_int() and self.is_real():
                 return ToReal(val)
+            if val_s.is_bool() and self.is_int():
+                return If(val, 1, 0)
+            if val_s.is_bool() and self.is_real():
+                return ToReal(If(val, 1, 0))
             if __debug__:
                 _z3_assert(False, "Z3 Integer/Real expression expected" )
         else: