[newbie] Read file, and append?

[Gilles Ganault]

On Tue, 25 Dec 2007 13:27:09 -0800, Dennis Lee Bieber
<wlfraed at ix.netcom.com> wrote:
>Ignoring the question of the proper I/O mode, I believe the I/O
>system MAY require one to perform a seek() when switching from read to
>write and vice versa...

I thought about this, but I don't understand why I would need to do
this:

myfile=open('test.txt','r+')
content = myfile.read()
myfile.seek()
myfile.write('added this')
myfile.close

Is there really no way to read from a file and append data to it while
keeping the file open?

Also, I noticed a problem with the code given by Garry: When opening a
file in binary mode, the EOF character is 0A, while Windows apps
expect 0D0A. VisualBasic was not happy :-)