[pypy-svn] r41010 - pypy/dist/demo

[hpk at codespeak.net]

Author: hpk
Date: Thu Mar 22 08:44:12 2007
New Revision: 41010

Added:
   pypy/dist/demo/tp-print-builtin-operation.py   (contents, props changed)
Log:
add a quick demo that prints operations on builtins


Added: pypy/dist/demo/tp-print-builtin-operation.py
==============================================================================
--- (empty file)
+++ pypy/dist/demo/tp-print-builtin-operation.py	Thu Mar 22 08:44:12 2007
@@ -0,0 +1,27 @@
+"""
+
+This example transparently intercepts and shows operations on 
+builtin objects.  It requires the "--with-transparent-proxy" option. 
+
+"""
+
+from tputil import make_proxy 
+from __pypy__ import become
+
+def make_show_proxy(instance):
+    def controller(operation):
+        res = operation.delegate()
+        print "proxy sees:", operation, "result=%s" %(res,)
+        return res
+    tproxy = make_proxy(controller, obj=instance)
+    return tproxy
+
+mydict = make_show_proxy({}) 
+
+assert type(mydict) is dict      # this looks exactly like a dict 
+mydict['hello'] = 'world'        # will print __
+mydict[42] = 23 
+assert mydict.pop('hello') == 'world'
+assert mydict.popitem() == (42,23)
+
+