decorator added

Author: lev epshtein

decorators/time.measure.deco2.py

@@ -0,0 +1,21 @@
+from time import sleep, time
+from functools import wraps
+
+
+def measure(func):
+    @wraps(func)
+    def wrapper(*args, **kwargs):
+        t = time()
+        func(*args, **kwargs)
+        print(func.__name__, 'took:', time() - t)
+    return wrapper
+
+
+@measure
+def f(sleep_time=0.1):
+    """I'm a cat. I love to sleep! """
+    sleep(sleep_time)
+
+
+f(sleep_time=0.3)  # f took: 0.3010902404785156
+print(f.__name__, ':', f.__doc__)  # f : I'm a cat. I love to sleep!

decorators/time.measure.dry.py

@@ -0,0 +1,16 @@
+# whole timing mechanism has been encapsulated into
+# a function so we don't repeat code. 
+
+from time import sleep, time
+
+def f():
+    sleep(.3)
+
+def g():
+    sleep(.5)
+
+def measure(func):
+    t = time()
+    func()
+
+print(func.__name__, 'took:', time() - t)

decorators/time.measure.start.py

@@ -0,0 +1,14 @@
+from time import sleep, time
+
+def f():
+    sleep(.3)
+
+def g():
+    sleep(.5)
+    
+t = time()
+f()
+print('f took: ', time() - t) # f took: 0.3003859519958496
+t = time()
+g()
+print('g took:', time() - t) # g took: 0.5005719661712646

decorators/time.measute.deco1.py

@@ -0,0 +1,17 @@
+from time import sleep, time
+
+def f(sleep_time=0.1):
+    sleep(sleep_time)
+
+def measure(func):
+    def wrapper(*args, **kwargs):
+        t = time()
+        func(*args, **kwargs)
+        print(func.__name__, 'took:', time() - t)
+    return wrapper
+
+f = measure(f) # decoration point
+
+f(0.2) # f took: 0.2002875804901123
+f(sleep_time=0.3) # f took: 0.3003721237182617
+print(f.__name__) # wrapper <- ouch!

decorators/two.decorators.py

@@ -0,0 +1,29 @@
+from time import sleep, time
+from functools import wraps
+
+def measure(func):
+    @wraps(func)
+    def wrapper(*args, **kwargs):
+        t = time()
+        result = func(*args, **kwargs)
+        print(func.__name__, 'took:', time() - t)
+        return result
+    return wrapper
+
+def max_result(func):
+    @wraps(func)
+    def wrapper(*args, **kwargs):
+        result = func(*args, **kwargs)
+        if result > 100:
+            print('Result is too big ({0}). Max allowed is 100.'
+                  .format(result))
+        return result
+    return wrapper
+
+@measure
+@max_result
+def cube(n):
+    return n ** 3
+
+print(cube(2))
+print(cube(5))

generators/generator.py

@@ -20,8 +20,8 @@
 
 ## Generator expressions
 
-# my_nums = list(x*x for x in [1,2,3,4,5])
-# my_sum = sum([x*x for x in range(1,10)])
+my_nums = list(x*x for x in [1,2,3,4,5])
+my_sum = sum([x*x for x in range(1,10)])
 
 # print (my_nums)
 # print (my_sum)