diff --git a/Lib/inspect.py b/Lib/inspect.py
index 79565c1..1f1b7f9 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -398,12 +398,12 @@
     if ismodule(object):
         if hasattr(object, '__file__'):
             return object.__file__
-        raise TypeError('arg is a built-in module')
+        raise TypeError('{!r} is a built-in module'.format(object))
     if isclass(object):
         object = sys.modules.get(object.__module__)
         if hasattr(object, '__file__'):
             return object.__file__
-        raise TypeError('arg is a built-in class')
+        raise TypeError('{!r} is a built-in class'.format(object))
     if ismethod(object):
         object = object.__func__
     if isfunction(object):
@@ -414,8 +414,8 @@
         object = object.f_code
     if iscode(object):
         return object.co_filename
-    raise TypeError('arg is not a module, class, method, '
-                    'function, traceback, frame, or code object')
+    raise TypeError('{!r} is not a module, class, method, '
+                    'function, traceback, frame, or code object'.format(object))
 
 ModuleInfo = namedtuple('ModuleInfo', 'name suffix mode module_type')
 
@@ -747,7 +747,7 @@
     names of the * and ** arguments or None."""
 
     if not iscode(co):
-        raise TypeError('arg is not a code object')
+        raise TypeError('{!r} is not a code object'.format(co))
 
     nargs = co.co_argcount
     names = co.co_varnames
@@ -811,7 +811,7 @@
     if ismethod(func):
         func = func.__func__
     if not isfunction(func):
-        raise TypeError('arg is not a Python function')
+        raise TypeError('{!r} is not a Python function'.format(func))
     args, varargs, kwonlyargs, varkw = _getfullargs(func.__code__)
     return FullArgSpec(args, varargs, varkw, func.__defaults__,
             kwonlyargs, func.__kwdefaults__, func.__annotations__)
@@ -944,7 +944,7 @@
     else:
         lineno = frame.f_lineno
     if not isframe(frame):
-        raise TypeError('arg is not a frame or traceback object')
+        raise TypeError('{!r} is not a frame or traceback object'.format(frame))
 
     filename = getsourcefile(frame) or getfile(frame)
     if context > 0: