removed 1st edition code

17-it-generator/tree/step1/test_tree.py

@@ -1,21 +0,0 @@
-from tree import tree
-
-
-def test_1_level():
-    class One: pass
-    expected = [('One', 0)]
-    result = list(tree(One))
-    assert expected == result 
-
-
-def test_2_levels_2_leaves():
-    class Branch: pass
-    class Leaf1(Branch): pass
-    class Leaf2(Branch): pass
-    expected = [
-        ('Branch', 0),
-            ('Leaf1', 1),
-            ('Leaf2', 1),
-    ]
-    result = list(tree(Branch))
-    assert expected == result 

17-it-generator/tree/step1/tree.py

@@ -1,10 +0,0 @@
-def tree(cls):
-    yield cls.__name__, 0                        # <1>
-    for sub_cls in cls.__subclasses__():         # <2>
-        yield sub_cls.__name__, 1                # <3>
-
-
-if __name__ == '__main__':
-    for cls_name, level in tree(BaseException):
-        indent = ' ' * 4 * level                 # <4>
-        print(f'{indent}{cls_name}')