Something like this might work, then:
>>> from sympy.utilities.iterables import cart
>>> terms = [x, x+y, x-y]
>>> for e in cartes(terms, ["+","-"], terms):
... expr = ' '.join([str(x) for x in e])
... ans = S(expr)
... print expr,';',ans
...
x - y + x - y ; 2*x - 2*y
x - y + x ; 2*x - y
x - y + x - 2*y ; 2*x - 3*y
x - y - x - y ; -2*y
x - y - x ; -y
x - y - x - 2*y ; -3*y
x + x - y ; 2*x - y
x + x ; 2*x
x + x - 2*y ; 2*x - 2*y
x - x - y ; -y
x - x ; 0
x - x - 2*y ; -2*y
x - 2*y + x - y ; 2*x - 3*y
x - 2*y + x ; 2*x - 2*y
x - 2*y + x - 2*y ; 2*x - 4*y
x - 2*y - x - y ; -3*y
x - 2*y - x ; -2*y
x - 2*y - x - 2*y ; -4*y
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