Python path and append

[Seymore4Head]

I am using a test file that is only 3 lines:
Punjabi .Mp3
Big Lake (DVD) SWV.avi
Blue Balloon.AHC.RH.mkv

The program correctly appends an * to the end of the line, but then it
goes into a loop printing random looking stuff.

f = open('wout.txt', 'r+')
for line in f:
    if line=="":
        exit
    line=line[:-1]
    line=line+" *"
    f.write(line)
    print line
f.close()


On Mon, 25 Apr 2016 20:44:50 +0100, MRAB <python at mrabarnett.plus.com>
wrote:

>On 2016-04-25 20:08, Joaquin Alzola wrote:
>> Strip() = white spaces.
>> Description
>> The method strip() returns a copy of the string in which all chars have been stripped from the beginning and the end of the string (default whitespace characters).
>>
>> Use to remove return carriage--> line[:-1]
>>
>1. In the file it might be a linefeed, or a carriage return, or a
>carriage return followed by a linefeed, depending on the operating
>system. Python translates it to a linefeed "\n" (or 'newline') on
>reading.
>
>2. It's possible that the last line doesn't end have a line ending, so
>line[:-1] could be removing some other character. It's safer to use
>line.rstrip("\n").
>
>> -----Original Message-----
>> From: Python-list [mailto:python-list-bounces+joaquin.alzola=lebara.com at python.org] On Behalf Of Seymore4Head
>> Sent: 25 April 2016 20:01
>> To: python-list at python.org
>> Subject: Re: Python path and append
>>
>> On Mon, 25 Apr 2016 18:24:02 -0000 (UTC), Rob Gaddi <rgaddi at highlandtechnology.invalid> wrote:
>>
>>>Seymore4Head wrote:
>>>
>>>> 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.
>>>
>>>"for line in f:" already means "make the variable line equal to each
>>>line in f sequentially".  f.read is both superfluous and also doesn't
>>>do that.  Leave it out entirely.
>>>
>>>The next problem you'll have is that iterating over the lines of the
>>>file leaves the newline at the end of line, so your * will end up on
>>>the wrong line.
>>>
>>>Do yourself a favor:
>>>https://docs.python.org/3/tutorial/inputoutput.html
>>>isn't very long.
>>
>> I was reading that.  I have read it before.  I don't use python enough to even remember the simple stuff.  Then when I try to use if for something simple I forget how.
>>
>> f = open('wout.txt', 'r+')
>> for line in f:
>>     line=line.strip()
>>     f.write(line+" *")
>> f.close()
>>
>> Still broke.  How about just telling me where I missed?  Please?
>> --
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>>