Added example solutions to several chapters. Feel free to create a pull request with your answers. Also for the chapters that have no solutions yet :)

CH_08_metaclasses/exercise_02/solution_00.py

@@ -0,0 +1,25 @@
+# Create a metaclass to test if specific classes are inherited.
+
+
+class SomeBaseClass:
+    pass
+
+
+class ExpectedBasesMeta(type):
+    _expected_bases = [SomeBaseClass]
+
+    def __new__(cls, name, bases, attrs):
+        for base in cls._expected_bases:
+            if base not in bases:
+                raise TypeError(
+                    f'{name} is not inheriting {base}'
+                )
+        return super().__new__(cls, name, bases, attrs)
+
+
+class Trade(SomeBaseClass, metaclass=ExpectedBasesMeta):
+    pass
+
+
+class BrokenTrade(metaclass=ExpectedBasesMeta):
+    pass