Question on File Input and AST

joy99 subhakolkata1234 at gmail.com
Tue Sep 8 11:56:40 CEST 2009


On Sep 6, 1:49 pm, Steven D'Aprano <st... at REMOVE-THIS-
cybersource.com.au> wrote:
> On Sun, 06 Sep 2009 00:53:43 -0700,joy99wrote:
> > Dear Group,
>
> > I have a file "test1.txt". Now, as I do the file handling, i try to do
> > any one of the following operations.
>
> > 1. open_file=open("/python26/test1.txt","r") # FOR READING 2.
> > open_file=open("/python26/test1.txt","r+") # FOR READING AND WRITING
> > BOTH
> > [Either of 1 or 2 to open as the need be] 3. read_file=open_file.read()
> > etc...
>
> > But how to work with "fileinput" or "ast".
>
> > I tried to read python docs and some backlog question answer in the
> > group but it did not help much.
>
> At the interactive interpreter, do this:
>
> >>> import fileinput
> >>> help(fileinput)
>
> and read the help text. It gives you an example:
>
>     [quote]
>     Typical use is:
>
>         import fileinput
>         for line in fileinput.input():
>             process(line)
>
>     This iterates over the lines of all files listed in sys.argv[1:],
>     defaulting to sys.stdin if the list is empty.  If a filename is '-' it
>     is also replaced by sys.stdin.  To specify an alternative list of
>     filenames, pass it as the argument to input().  A single file name is
>     also allowed.
>     [end quote]
>
> If there is something unclear about that, then please try to be specific
> about what you don't understand. Try some code, and report what errors
> you get.
>
> As far as ast, there's an example here:
>
> http://docs.python.org/dev/whatsnew/2.6.html#the-ast-module
>
> and a discussion here:
>
> http://stackoverflow.com/questions/768634/python-parse-a-py-file-read...
> ast-modify-it-then-write-back-the-modified
>
> If you explain what you want to do, perhaps there's somebody out there
> who knows the ast module and can answer.
>
> --
> Steven- Hide quoted text -
>
> - Show quoted text -

Dear Sir,

Thank you for your kind reply. I will have a check on them soon.

Warm Regards,
Subhabrata.



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