simplify expression into summation

[Nova Munch]

hello, 

2 questions related to reducing to summation using sympy:

1) lets say i have an expression (x) + (x+1) + (x+2) + (x+3) + (x+4)

is there any function to help me simplify/reduce it to become summation of x over 0 to 4?

along the same line:

2) lets say i have an expression (x[0]*y[0]) + (x[1]*y[1]) + (x[2]*y[2]) + (x[3]*y[3]) + (x[4]*y[4]),

is there any function to help me simplify/reduce it to become summation of x[i]*y[i] over 0 to 4?

perhaps it can't be done in the raw form above, maybe i need to use some annotations or use certain types of special symbols? 

NM

[Aaron Meurer]

Like

i = Symbol('i')
summation(x + i, (i, 0, 4))

If you are looking for something that generates a summation
automatically, I don't think such a thing exists.

Aaron Meurer

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