filling numpy array with random element from another array

filling numpy array with random element from another array

Hi I'm not sure if this is possible but here goes. Suppose I have an array
as such: array1 = [0,.1,.2,.3,.4,.5,.6,.7,.8,.9,1]
and now I would like to create a numpy 1D array consisting of 5 elements
that is randomely drawn from array1 AND with the condition that the sum is
equal to 1. Example is something like, a numpy array that looks like
[.2,.2,.2,.1,.1].
currently I use the random module, and choice function that looks like
this: range1=
np.array([choice(array1),choice(array1),choice(array1),choice(array1),choice(array1)])
then checking range1 to see if it meets the criteria; I'm wondering if
there is faster way , something similiar to randomArray =
np.random.random() instead.
Would be even better if I can store this array in some library so that if
I try to generate 100 of such array, that there is no repeat but this is
not necessary.