python 3.x - How to find the middle of a line in a file -

i writing code class , having trouble finding middle of line. have prompt user file, read it, split individual lines, , add specific word beginning, middle, , end of each line. not sure how middle

file = str(input("enter input file:" "")) my_file = open(file, "r") file_contents = my_file.read() #change "e"s "zw"s          letter in file_contents:             if letter == "e":                 file_contents = file_contents.replace(letter, "zw") #add "hokie" beginning, middle, , end of each line         lines = file_contents.split('\n') #i know following line wrong, i'm not sure how fix         middle_message = lines[len(lines) /2:] + "hokie"         message = "hokie" + middle_message + "hokie" 

you'll have better time solving of yourself.

here's hint though: should middle_message contain? concrete example, if line 'abcd', want change line 'hokieabhokiecdhokie'. see if can point out ab , cd parts come in code snippet.