The as_coeff_Add method is probably what you want:

>>> (x+y).as_coeff_Add()
(0, x + y)
>>> (x+y+3).as_coeff_Add()
(3, x + y)
>>> (3*x).as_coeff_Add()
(0, 3*x)
>>> (x+y+3.0).as_coeff_Add()
(3.00000000000000, x + y)

/c

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