See nedbat#33

Author: rocky

test/bytecode-2.5/test_bound_method_on_falsy_objects.pyc

@@ -0,0 +1,8 @@
+class Falsy(object):
+    def __bool__(self):
+            return False
+    __nonzero__ = __bool__
+    def do_stuff(self):
+            pass
+
+Falsy().do_stuff()

test/bytecode-2.6/test_bound_method_on_falsy_objects.pyc

@@ -26,6 +26,9 @@ def test_globals(self):
     def test_inplace_operators(self):
         self.do_one()
 
+    def test_bound_method_on_falsy_objects(self):
+        self.do_one()
+
     if PY2:
         def test_inplace_division(self):
             self.assert_ok("""\

test/bytecode-2.7/test_bound_method_on_falsy_objects.pyc

@@ -66,31 +66,20 @@ def __init__(self, python_version=PYTHON_VERSION):
                 from xpython.byteop.byteop26 import ByteOp26
                 self.byteop = ByteOp26(self)
                 pass
-            elif int_vers == 25:
-                from xpython.byteop.byteop25 import ByteOp25
-                self.byteop = ByteOp25(self)
-                pass
             pass
         else:
             # 3.0 or greater
-            if int_vers < 34:
-                if int_vers == 32:
-                    from xpython.byteop.byteop32 import ByteOp32
-                    self.byteop = ByteOp32(self)
-                elif int_vers == 33:
-                    from xpython.byteop.byteop33 import ByteOp33
-                    self.byteop = ByteOp33(self)
-                else:
-                    self.byteop = None
+            if int_vers == 33:
+                from xpython.byteop.byteop33 import ByteOp33
+                self.byteop = ByteOp33(self)
+            elif int_vers == 34:
+                from xpython.byteop.byteop34 import ByteOp34
+                self.byteop = ByteOp34(self)
+            elif int_vers == 35:
+                from xpython.byteop.byteop35 import ByteOp35
+                self.byteop = ByteOp35(self)
             else:
-                if int_vers == 34:
-                    from xpython.byteop.byteop34 import ByteOp34
-                    self.byteop = ByteOp34(self)
-                elif int_vers == 35:
-                    from xpython.byteop.byteop35 import ByteOp35
-                    self.byteop = ByteOp35(self)
-                else:
-                    self.byteop = None
+                self.byteop = None
 
     def top(self):
         """Return the value at the top of the stack, with no changes."""
@@ -735,7 +724,7 @@ def byte_SETUP_WITH(self, dest):
     ## Functions
 
     def byte_MAKE_CLOSURE(self, argc):
-        if PYTHON_VERSION >= 3.3:
+        if PYTHON3:
             # TODO: the py3 docs don't mention this change.
             name = self.pop()
         else:
@@ -774,7 +763,7 @@ def call_function(self, arg, args, kwargs):
         func = self.pop()
         if hasattr(func, "im_func"):
             # Methods get self as an implicit first parameter.
-            if func.im_self:
+            if func.im_self is not None:
                 posargs.insert(0, func.im_self)
             # The first parameter must be the correct type.
             if not isinstance(posargs[0], func.im_class):