Attribute Error

[Adit99]

trying to convert an integer tuple to a binary (string) tuple.
getting an Attribute error as follow.

def __int_to_bin(rgb):
        r, g, b = rgb.split(' ')
        return ('{0:08b}'.format(r,),
                '{0:08b}'.format(g,),
                '{0:08b}'.format(b,))

this is the error

Error:
File "C:/Users/adit1/AppData/Local/Programs/Python/Python37-32/Stego/aug17.py", line 12, in __int_to_bin
    r, g, b = rgb.split(' ')
AttributeError: 'tuple' object has no attribute 'split'