* Added block_timer class for use in python 2.5+ "with ..." construct.

timer.py

@@ -28,3 +28,49 @@ class timer:
   def length(self):
     return self.tm2 - self.tm1
 
+
+class block_timer(object):
+  """Timer for a code block in python.
+  For use with python 2.5+ 'with' statement.
+  See: http://preshing.com/20110924/timing-your-code-using-pythons-with-statement
+
+  To use this:
+
+      with block_timer() as t:
+        <code>
+  """
+  @staticmethod
+  def writeout_file(out):
+    return lambda tm: out.write("Total execution time = %s secs\n" % (tm,))
+  @staticmethod
+  def writeout_dict(rec, key):
+    def wrt_dict(tm):
+      rec[key] = tm
+    return wrt_dict
+    #return lambda tm: rec.__setitem__(key, tm)
+
+  @staticmethod
+  def bt_file(fobj):
+    if isinstance(fobj, basestring):
+      from wpylib.iofmt.text_output import text_output
+      out = text_output(fobj)
+    else:
+      out = fobj
+    return block_timer(report=block_timer.writeout_file(out))
+
+  @staticmethod
+  def bt_dict(rec, key):
+    return block_timer(report=block_timer.writeout_dict(rec, key))
+
+  def __init__(self, report=None):
+    if report == None: report = block_timer.writeout_file(sys.stdout)
+    self.report = report
+
+  def __enter__(self):
+    self.start = time.clock()
+    return self
+
+  def __exit__(self, *args):
+    self.end = time.clock()
+    self.interval = self.end - self.start
+    self.report(self.interval)