python string get everything after character code example

Example 1: get string until character python

s = "first_second"
s.split('_')[0] # Split the string on '_' return the first part. 
>>> 'first'

Example 2: python extract all characters from string before a character

s1 = "Username: How are you today?"
>>> s1.split(':')
['Username', ' How are you today?']
>>> s1.split(':')[0]
'Username'