File I/O

[Ant]

Kirt wrote:
...
> i dont wanna parse the xml file..
>
> Just open the file as:
>
> f=open('test.xml','a')
>
> and append a line "<Body2>abc</Body2>" before  tag </Top>

The other guys are right - you should look at something like
ElementTree which makes this sort of thing pretty easy, and is robust.
But if you are sure that:

1) </Top> is going to be on its own line (rather than something like
</Body1></Top>)
2) the ending tag will *definitely* have no extraneous whitespace (e.g.
< / Top >)

then the following will probably be the simplest solution:

f=open('test.xml')
out = []
for line in f:
    if "</Top>" in line:
        out.append("<Body2>abc</Body2>")
    out.append(line")

f.close()

f_out = open("test.xml", "w")
f.write("".join(out))
f_out.close()

If you're working with XML in any sort of quantity, then look into the
available XML tools - it will be worth your time.