Replace text in file in Python

Question

I am trying to replace some text in a file with a value. Everything works fine, but when I look at the file after it is finished, a new (empty) line appears after each line in the file. Is there something I can do to prevent this from happening.

Here is the code I have:

import fileinput for line in fileinput.FileInput("testfile.txt",inplace=1): line = line.replace("newhost",host) print line 

Thanks Aaron

Answer 1

Each line read from the file with the end of a new line, and printing adds one of its own.

You can:

 print line, 

Which does not add a new line after the line.

Answer 2

print line automatically adds a new line. It is best to do sys.stdout.write(line) .

Answer 3

print adds a newline:

The character A '\ n' is written at the end if the print statement does not end with a comma. This is the only action if the statement contains only a listing of the keyword.