Python path and append

[John Gordon]

In <27nshbp40p1llr231dqm31p754tvurkb8i at 4ax.com> Seymore4Head <Seymore4Head at Hotmail.invalid> writes:

> On Tue, 19 Apr 2016 18:29:38 -0400, Seymore4Head
> <Seymore4Head at Hotmail.invalid> wrote:

> I am going to forget using a directory path.
> I would like to take the file win.txt and append a space and the *
> symbol.

> f = open('win.txt', 'r+')
> for line in f:
>     f.read(line)
>     f.write(line+" *")

> This doesn't work.  Would someone fix it please?  It is for a task I
> am trying to accomplish just for a home task.

It's much easier to create a new file and then rename it afterwards,
instead of rewriting the original file.

    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')

-- 
John Gordon                   A is for Amy, who fell down the stairs
gordon at panix.com              B is for Basil, assaulted by bears
                                -- Edward Gorey, "The Gashlycrumb Tinies"