adding all files done so far

learning/descriptors/descriptors.py

@@ -0,0 +1,18 @@
+class Person(object):
+    """docstring for Person"""
+    def __init__(self, name, age):
+        super(Person, self).__init__()
+        self.name = name
+        self.age = age
+
+    @property
+    def age(self):
+        print('old enough')
+        return self.__age
+
+    @age.setter
+    def age(self, value):
+        if value < 21:
+            raise Exception(f'{self.name} is not old enough.')
+        else:
+            self.__age = value