how to split the given statement using split() function in python

s = input("enter any sentence")
for w in s.split():
    print(w)

this script will split the entered sentence based on the space 

if we entered the sentence as  , python is using by rby , then result is 

python

is

using

by

rby

if we use the split like below 

s = input("enter any sentence")

for w in s.split(':'):

    print(w)

then 

it will work as follows

ramesh:rby:python

ramesh

rby

python