ch17: update from book draft

17-it-generator/tree/4steps/tree_step0.py

@@ -0,0 +1,7 @@
+def tree(cls):
+    yield cls.__name__
+
+
+if __name__ == '__main__':
+    for cls_name in tree(BaseException):
+        print(cls_name)

17-it-generator/tree/4steps/tree_step1.py

@@ -0,0 +1,10 @@
+def tree(cls):
+    yield cls.__name__, 0
+    for sub_cls in cls.__subclasses__():
+        yield sub_cls.__name__, 1
+
+
+if __name__ == '__main__':
+    for cls_name, level in tree(BaseException):
+        indent = ' ' * 4 * level
+        print(f'{indent}{cls_name}')

17-it-generator/tree/4steps/tree_step2.py

@@ -0,0 +1,12 @@
+def tree(cls):
+    yield cls.__name__, 0
+    for sub_cls in cls.__subclasses__():
+        yield sub_cls.__name__, 1
+        for sub_sub_cls in sub_cls.__subclasses__():
+            yield sub_sub_cls.__name__, 2
+
+
+if __name__ == '__main__':
+    for cls_name, level in tree(BaseException):
+        indent = ' ' * 4 * level
+        print(f'{indent}{cls_name}')

17-it-generator/tree/4steps/tree_step3.py

@@ -0,0 +1,10 @@
+def tree(cls, level=0):
+    yield cls.__name__, level
+    for sub_cls in cls.__subclasses__():
+        yield from tree(sub_cls, level + 1)
+
+
+if __name__ == '__main__':
+    for cls_name, level in tree(BaseException):
+        indent = ' ' * 4 * level
+        print(f'{indent}{cls_name}')