I would prefer using what is already implemented in the poly module.
This means that you must transform your expression into a polynomial:

In [2]: a = Poly(1+x**2+y)

In [6]: a.gens # the generators of the polynomial
Out[6]: (x, y)

In [3]: a.monoms() # the powers of each generator in each monomial
Out[3]: [(2, 0), (0, 1), (0, 0)]

In [4]: a.coeffs() # the coefficients in front of each monomial
Out[4]: [1, 1, 1]

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