Python dir() built-in function
From the Python 3 documentation
Without arguments, return the list of names in the current local scope. With an argument, attempt to return a list of valid attributes for that object.
Examples
>>> dir()
# ['__annotations__', '__builtins__', '__doc__', ...]
>>> dir(1)
# ['__abs__', '__add__', '__and__', '__bool__', ...]
>>> dir('a')
# ['__add__', '__class__', '__contains__', ...]
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