Python - Convert Underscore to Fullstop

Question

Convert String '321_1' to '321.1'.

I would like to create a method to convert the underscore to full stop. i used split but it cant work .. Anyone can help me? or must i use while loop

Convert underscore to fullstop

def Convert_toFullStop(text):

    x1 = ""
    words = text.split()
    if words in ("_"):
        words = "."
    print words

Answer 1

use the replace() function?

newtext = text.replace('_','.')

Answer 2

I would do

def Convert_toFullStop(text):
    return text.replace('_', '.')

and leave the print to the caller.