Closes #14: Fix binding with self as a kwarg.

CHANGELOG

@@ -1,6 +1,11 @@
 Changelog
 ---------
 
+0.5
+```
+
+* Fix binding with self as a kwarg. (Robert Collins #14)
+
 0.4 (2013-12-20)
 ````````````````
 * Fix unbound methods getting their first parameter curried

funcsigs/__init__.py

@@ -769,16 +769,16 @@ class Signature(object):
                 # Process our '**kwargs'-like parameter
                 arguments[kwargs_param.name] = kwargs
             else:
-                raise TypeError('too many keyword arguments')
+                raise TypeError('too many keyword arguments %r' % kwargs)
 
         return self._bound_arguments_cls(self, arguments)
 
-    def bind(self, *args, **kwargs):
+    def bind(*args, **kwargs):
         '''Get a BoundArguments object, that maps the passed `args`
         and `kwargs` to the function's signature.  Raises `TypeError`
         if the passed arguments can not be bound.
         '''
-        return self._bind(args, kwargs)
+        return args[0]._bind(args[1:], kwargs)
 
     def bind_partial(self, *args, **kwargs):
         '''Get a BoundArguments object, that partially maps the

tests/test_inspect.py

@@ -1,6 +1,7 @@
 # Copyright 2001-2013 Python Software Foundation; All Rights Reserved
 from __future__ import absolute_import, division, print_function
 import collections
+import functools
 import sys
 
 try:
@@ -982,6 +983,15 @@ def test_signature_bind_positional_only(self):
         self.call(test, a_po=1, b_po=2)
 """)
 
+    def test_bind_self(self):
+        class F:
+            def f(a, self):
+                return a, self
+        an_f = F()
+        partial_f = functools.partial(F.f, an_f)
+        ba = inspect.signature(partial_f).bind(self=10)
+        self.assertEqual((an_f, 10), partial_f(*ba.args, **ba.kwargs))
+
 
 class TestBoundArguments(unittest.TestCase):