write and Replace particular line in file

Question

I want to replace value of key(i.e db_host, addons_path) with $$$$.

Input text file contains the following:

#         


        

Answer 1

What about something like this ?

def replace_string(s):
    s = s.replace('db_host','$$$$')
    return s
with open('test.txt','r') as fo:
    line = fo.read() # you could use strip() or split() additionally
new_string = replace_string(line)