Python oct() built-in function
From the Python 3 documentation
Convert an integer number to an octal string prefixed with “0o”. The result is a valid Python expression. If x is not a Python int object, it has to define an __index__() method that returns an integer.
Examples
>>> oct(1)
# '0o1'
>>> oct(10)
# '0o12'
>>> oct(100)
# '0o144'
>>> oct(1000)
# '0o1750'
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