# occurance_index.py

# occurance_index.py

def index_occur(var,target,n,z=0):
    for i in range(n): z = var.index(target,z+i)
    return z

T = ('1st target is at 1', 5, '2nd target is at 3', 5, 3, -1, '3rd target is at 7', 5, 25)

print (index_occur(T,5,3))