ch17: update from book draft

17-it-generator/tree/step5/tree.py

@@ -0,0 +1,15 @@
+def tree(cls):
+    yield cls.__name__, 0
+    yield from sub_tree(cls, 1)
+
+
+def sub_tree(cls, level):
+    for sub_cls in cls.__subclasses__():
+        yield sub_cls.__name__, level
+        yield from sub_tree(sub_cls, level+1)
+
+
+if __name__ == '__main__':
+    for cls_name, level in tree(BaseException):
+        indent = ' ' * 4 * level
+        print(f'{indent}{cls_name}')