Limited or projected gradient descent using any python library?

Question

I have this optimization problem and I wonder if any function in any python library can solve it? Let's say I want to minimize f(x)using gradient descent. x - vector of, say 3 dimension x=(x1,x2,x3). Restriction x1>0, x2>0, x3>0and x1+x2+x3=1. Any function can solve this limited gradient descent? Thank.