Create a compress function in Python?

Question

I need to create a function called compress that compresses a string by replacing any repeated letters with a letter and number. My function should return the shortened vers

Answer 1

x="mississippi"
res = ""
count = 0
while (len(x) > 0):
    count = 1
    res= ""
    for j in range(1, len(x)):
        if x[0]==x[j]:
            count= count + 1
        else:
            res = res + x[j]
    print(x[0], count, end=" ")
    x=res