generating an array of probabilities

I need to calculate the probability of each number whose sum is 1. Suppose we have an array

mass=[1,2,3,4,5]

You need to calculate the probabilities of these numbers.

algorithm:

for i:=1 to n do
  I[i]:=i;
endfor;
for s:=n downto n-m+1 do
  l:=random(1,s);
  L[n-s+1]:=I[l];
  I[l]:=I[s];
  DEC(s);
endfor.

the first thing I did was calculate the probability for the numbers

def frange(x, y, jump):
    while x < y:
        yield x
        x += jump

s = []
zn=[1,2,3,4,5]
a=0
b=2
for i in frange(a,b,(b-a)/len(zn)):
    s.append(i)
print(s)

then I don't quite understand what to do.