ex 7.5

mymeta.py

@@ -0,0 +1,24 @@
+class mytype(type):
+    @staticmethod
+    def __new__(meta, name, bases, __dict__):
+        print('Creating class :', name)
+        print('Base classes   :', bases)
+        print('Attributes     :', list(__dict__))
+        return super().__new__(meta, name, bases, __dict__)
+
+
+class myobject(metaclass=mytype):
+    pass
+
+
+class Stock(myobject):
+    def __init__(self, name, shares, price):
+        self.name = name
+        self.shares = shares
+        self.price = price
+
+    def cost(self):
+        return self.shares * self.price
+
+    def sell(self, nshares):
+        self.shares -= nshares