Python Remove last 3 characters of a string

Question

I\'m trying to remove the last 3 characters from a string in python, I don\'t know what these characters are so I can\'t use rstrip, I also need to remove any white

Answer 1

>>> foo = "Bs12 3ab"
>>> foo[:-3]
'Bs12 '
>>> foo[:-3].strip()
'Bs12'
>>> foo[:-3].strip().replace(" ","")
'Bs12'
>>> foo[:-3].strip().replace(" ","").upper()
'BS12'