[Assorted-commits] SF.net SVN: assorted: [229] python-commons/trunk/src/commons/misc.py

[<yan...@us...>]

Revision: 229
          http://assorted.svn.sourceforge.net/assorted/?rev=229&view=rev
Author:   yangzhang
Date:     2008-01-12 18:30:22 -0800 (Sat, 12 Jan 2008)

Log Message:
-----------
added wall_clock

Modified Paths:
--------------
    python-commons/trunk/src/commons/misc.py

Modified: python-commons/trunk/src/commons/misc.py
===================================================================
--- python-commons/trunk/src/commons/misc.py	2008-01-13 02:30:11 UTC (rev 228)
+++ python-commons/trunk/src/commons/misc.py	2008-01-13 02:30:22 UTC (rev 229)
@@ -1,6 +1,9 @@
 # -*- mode: python; tab-width: 4; indent-tabs-mode: nil; py-indent-offset: 4; -*-
 # vim:ft=python:et:sw=4:ts=4
 
+from contextlib import *
+from time import *
+
 """
 Miscellanea.
 """
@@ -21,3 +24,25 @@
     for i in xrange( count ):
         yield j
         j <<= 1
+
+@contextmanager
+def wall_clock(output):
+    """
+    A simple timer for code sections.
+
+    @param output: The resulting time is put into index 0 of L{output}.
+    @type output: index-writeable
+
+    Example:
+
+        t = [0]
+        with wall_clock(t):
+            sleep(1)
+        print "the sleep operation took %d seconds" % t[0]
+    """
+    start = time()
+    try:
+        yield
+    finally:
+        end = time()
+        output[0] = end - start


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