Re: Appending an asterisk to the end of each line

[MRAB]

On 2016-07-06 00:45, Seymore4Head wrote:
On Tue, 05 Jul 2016 19:29:21 -0400, Seymore4Head
<Seymore4Head@Hotmail.invalid> wrote:
On Tue, 5 Jul 2016 19:15:23 -0400, Joel Goldstick
<joel.goldst...@gmail.com> wrote:

On Tue, Jul 5, 2016 at 7:03 PM, MRAB <pyt...@mrabarnett.plus.com> wrote:
On 2016-07-05 23:05, Seymore4Head wrote:

import os

f_in = open('win.txt', 'r')
f_out = open('win_new.txt', 'w')

for line in f_in.read().splitlines():
    f_out.write(line + " *\n")

f_in.close()
f_out.close()

os.rename('win.txt', 'win_old.txt')
os.rename('win_new.txt', 'win.txt')


I just tried to reuse this program that was posted several months ago.
I am using a text flie that is about 200 lines long and have named it
win.txt.  The file it creates when I run the program is win_new.txt
but it's empty.

Although it creates a file called "win_new.txt", it then renames it to
"win.txt", so "win_new.txt" shouldn't exist.

Of course, if there's already a file called "win_old.txt", then the first
rename will raise an exception, and you'll have "win_new.txt" and the
original "win.txt".

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Why don't you comment out the renames, and see what happens?

I really don't care if the filename gets renamed or not.  I commented
out the renames, but I still get a new file called win_new.txt and it
is empty.

The original is unchanged.

I just tried this on a 3 line text file and it works.

I am looking through the text file and have found at least two
suspicious characters.  One is a German letter and the other is a
characters that has been replaced by a square symbol.

That suggests to me that it's an encoding problem (the traceback 
would've indicated that).

Specify an encoding when you open the files:

f_in = open('win.txt', 'r', encoding='utf-8')
f_out = open('win_new.txt', 'w', encoding='utf-8')

assuming that 'win.txt' is indeed encoded in UTF-8. (It might be 
something like ISO-8859-1 instead.)

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