python文件的replace替换

filename = 'like.txt'

with open(filename) as fileobject:
    lines = fileobject.readlines()

message_string = ''
for line in lines:
    message_string +=line
print(message_string.title())

message = message_string.replace('python','ruby') #使用replace('old','new')来替换
print(message.title())