added __len__
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@@ -29,7 +29,7 @@ class Stack[T]:
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Returns:
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Returns:
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number of elements in the stack, as an integer
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number of elements in the stack, as an integer
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'''
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'''
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pass
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return len(self._data)
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def push(self, item: T) -> None:
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def push(self, item: T) -> None:
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''' pushes a given item of arbitrary type onto the stack
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''' pushes a given item of arbitrary type onto the stack
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