A priority of constrains for scipy.optimize.minimize

Hi,

I am solving a problem with some constrains. At first there is a 
constraint, that the sum of the percentages must be 1. The single 
percentage could be in the range from 0,0 to 1. And this is the main 
constraint. On the other side there are some constrains belonging to 
stuff of the calculation.  It is possible, that this constrains are to 
strong and the solver can't get a solution. In this Case I want to have 
an option to get a solution respecting the first constraint.

Has anybody an idea of a solution? I think there is no option for a 
priority of the constrains.

kind regards
Jan Hendrik Berlin