[pybank] Fix arg count check

[Johan Dahlin <johan src gnome org>]

commit 5a10a1d05c198fe8602c91398e4a8393c8e8a0da
Author: Tomeu Vizoso <tomeu sugarlabs org>
Date:   Fri May 8 12:27:01 2009 +0200

    Fix arg count check
---
 bank/btypes.py |   10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/bank/btypes.py b/bank/btypes.py
index a72c93a..8ee7fbb 100644
--- a/bank/btypes.py
+++ b/bank/btypes.py
@@ -83,7 +83,6 @@ class Callable(object):
 
     def __call__(self, *args, **kwargs):
         infoArgs = list(self.info.getArgs())
-        totalInArgs = len(args) + len(kwargs)
         requiredArgs = 0
         for arg in infoArgs:
             direct = arg.getDirection()
@@ -100,14 +99,13 @@ class Callable(object):
             elif is_method:
                 obj = args[0]
         elif self.call_type == self.CLASS_METHOD:
-            requiredArgs += 1
-            cls = args[0]
             args = args[1:]
-            
+
+        totalInArgs = len(args) + len(kwargs)
 
         if totalInArgs != requiredArgs:
-            raise TypeError('%r requires %d arguments' % (
-                self, requiredArgs))
+            raise TypeError('%r requires %d arguments, passed %d instead.' % (
+                self, requiredArgs, totalInArgs))
 
         inArgs = []
         for i, value in enumerate(args):