Initial commit

Solutions/6_3/stock.py

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+# stock.py
+
+from structure import Structure
+
+class Stock(Structure):
+    def __init__(self, name, shares, price):
+        self._init()
+
+    @property
+    def cost(self):
+        return self.shares * self.price
+
+    def sell(self, nshares):
+        self.shares -= nshares
+
+Stock.set_fields()
+