added timer context example

PythonCHB · PythonCHB · commit e328996a3a55 · 2015-12-08T21:02:23.000-08:00
diff --git a/Examples/Session10/context_managers.py b/Examples/Session10/context_managers.py
@@ -18,8 +18,12 @@ def __enter__(self):
 
     def __exit__(self, exc_type, exc_val, exc_tb):
         print('__exit__({}, {}, {})'.format(exc_type, exc_val, exc_tb))
-        return self.handle_error
+        if exc_type == ZeroDivisionError:
+            return True
+        else:
+            return False
 
+#            return self.handle_error
 
 @contextmanager
 def context(boolean):
diff --git a/Examples/Session10/decorators.py b/Examples/Session10/decorators.py
@@ -9,9 +9,9 @@ def new_function(*args, **kwargs):
 
 
 def add(a, b):
-    # print("Function 'add' called with args: {}, {}".format(a, b) )
+    print("Function 'add' called with args: {}, {}".format(a, b) )
     result = a + b
-    # print("\tResult --> {}".format(result))
+    print("\tResult --> {}".format(result))
     return result
 
 
@@ -49,10 +49,14 @@ def __call__(self, *args):  # runs when memoize instance is called
             return self.memoized[args]
 
 
-# @Memoize
+@Memoize
 def sum2x(n):
     return sum(2 * i for i in range(n))
-sum2x = Memoize(sum2x)
+# sum2x = Memoize(sum2x)
+
+@Memoize
+def prod2(a,b):
+    return sum( a * b**2 for a,b in zip(range(a), range(b)))
 
 import time
 
diff --git a/Examples/Session10/test_p_wrapper.py b/Examples/Session10/test_p_wrapper.py
@@ -4,7 +4,7 @@
 test code for the p_wrapper assignment
 """
 
-from p_wrapper import p_wrapper, tag_wrapper
+from p_wrapper import p_wrapper #, tag_wrapper
 
 
 def test_p_wrapper():
@@ -14,6 +14,14 @@ def return_a_string(string):
 
     assert return_a_string('this is a string') == '<p> this is a string </p>'
 
+def test_with_args():
+    @p_wrapper
+    def f_string(a, b, this=45 ):
+        return "the numbers are: {}, {}, {}".format(a,b,this)
+
+    assert f_string(2, 3, this=54) == "<p> the numbers are: 2, 3, 54 </p>"
+
+
 #Extra credit:
 
 def test_tag_wrapper():
diff --git a/Examples/Session10/timer_context.py b/Examples/Session10/timer_context.py
@@ -0,0 +1,20 @@
+#!/usr/bin/env python3
+
+"""
+Timer context manager
+"""
+import time
+
+
+class Timer:
+    def __init__(self, file_like):
+        self.file_like = file_like
+
+    def __enter__(self):
+        self.start = time.clock()
+
+    def __exit__(self, *args):
+        elapsed = time.clock() - self.start
+        msg = "Elapsed time: {} seconds".format(elapsed)
+        self.file_like.write(msg)
+        return False
