ch08, 09, 10: example files

09-closure-deco/registration_param.py

@@ -0,0 +1,28 @@
+# tag::REGISTRATION_PARAM[]
+
+registry = set()  # <1>
+
+def register(active=True):  # <2>
+    def decorate(func):  # <3>
+        print('running register'
+              f'(active={active})->decorate({func})')
+        if active:   # <4>
+            registry.add(func)
+        else:
+            registry.discard(func)  # <5>
+
+        return func  # <6>
+    return decorate  # <7>
+
+@register(active=False)  # <8>
+def f1():
+    print('running f1()')
+
+@register()  # <9>
+def f2():
+    print('running f2()')
+
+def f3():
+    print('running f3()')
+
+# end::REGISTRATION_PARAM[]