All combinations printing numbers

allcomb.py

a = [ 2,2,3,4]
b = []
print(a)
temp = 1
length = len(a)
for k in range(1,length):
    valk = k
    for i in range(length):
        for j in range(i+1,length):
            temp = 1
            k = valk
            while(k != 0 and k+j <= length):
                temp = temp * a[j+k-1]
                k -= 1
            if(k+j <= length):
               b.append(a[i]* temp)
               print(b)