string compression python
def compress(string):
index = 0
compressed = ""
len_str = len(string)
while index != len_str:
count = 1
while (index < len_str-1) and (string[index] == string[index+1]):
count = count + 1
index = index + 1
if count == 1:
compressed += str(string[index])
else:
compressed += str(string[index]) + str(count)
index = index + 1
return compressed
string = "pythooonnnpool"
print(compress(string))