adding all files done so far

learning/descriptors/descriptors2.py

@@ -0,0 +1,37 @@
+from weakref import WeakKeyDictionary
+
+
+class Drinker:
+    def __init__(self):
+        self.req_age = 21
+        self.age = dict()
+        print('init')
+
+    def __get__(self, instance_obj, objtype):
+        print(f'{instance_obj}, {objtype}, {self.age}')
+        return self.age.get(instance_obj, self.req_age)
+
+    def __set__(self, instance, new_age):
+        if new_age < 21:
+            msg = '{name} is too young to legally imbibe'
+            raise Exception(msg.format(name=instance.name))
+        self.age[instance] = new_age
+        print('{name} can legally drink in the USA'.format(
+            name=instance.name))
+
+    def __delete__(self, instance):
+        del self.age[instance]
+
+
+class Person:
+    drinker_age = Drinker()
+
+    def __init__(self, name, age):
+        self.name = name
+        self.drinker_age = age
+
+
+p = Person('Miguel', 30)
+p1 = Person('Bob', 50)
+
+p = Person('Niki', 13)