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Re: How to streamingly read text file and display whenever updated text

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On Sat, 05 Oct 2013 00:38:51 -0700, galeomaga wrote:

> #!/usr/bin/python
> import time
> f = open('/home/martin/Downloads/a.txt')
> while 1:
> 	for line in f:
> 		print line;
> 	time.sleep(1);

So you're trying to implement "tail -f"?

First, check that "tail -f" actually works for your particular use case.

If the process writing the file uses buffered output, data will only
actually be appended to the file when the buffer is full. You can't read
what isn't there.

And if the process creates a new file with the same name, rather than
appending to the existing file, you'll still be reading the old file. You
would need to open the file again to read the new file.

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How to streamingly read text file and display whenever updated text galeomaga@gmail.com - 2013-10-05 00:38 -0700
  Re: How to streamingly read text file and display whenever updated text galeomaga@gmail.com - 2013-10-05 00:54 -0700
    Re: How to streamingly read text file and display whenever updated text Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-10-05 09:12 +0100
  Re: How to streamingly read text file and display whenever updated text "James Harris" <james.harris.1@gmail.com> - 2013-10-05 09:06 +0100
    Re: How to streamingly read text file and display whenever updated text Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-10-05 09:14 +0100
  Re: How to streamingly read text file and display whenever updated text Nobody <nobody@nowhere.com> - 2013-10-05 11:25 +0100
  Re: How to streamingly read text file and display whenever updated text Joost Molenaar <j.j.molenaar@gmail.com> - 2013-10-05 13:02 +0200
    Re: How to streamingly read text file and display whenever updated text galeomaga@gmail.com - 2013-10-05 20:17 -0700
      Re: How to streamingly read text file and display whenever updated text Chris Angelico <rosuav@gmail.com> - 2013-10-06 14:28 +1100
      Re: How to streamingly read text file and display whenever updated text Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-10-06 04:06 +0000
        Re: How to streamingly read text file and display whenever updated text galeomaga@gmail.com - 2013-10-06 01:49 -0700
        Re: How to streamingly read text file and display whenever updated text Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-10-06 11:36 +0100
        Re: How to streamingly read text file and display whenever updated text Chris Angelico <rosuav@gmail.com> - 2013-10-06 22:03 +1100
        Re: How to streamingly read text file and display whenever updated text Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-10-06 12:13 +0100
        Re: How to streamingly read text file and display whenever updated text Chris Angelico <rosuav@gmail.com> - 2013-10-06 22:15 +1100
        Re: How to streamingly read text file and display whenever updated text Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-10-06 12:31 +0100
        Re: How to streamingly read text file and display whenever updated text Chris Angelico <rosuav@gmail.com> - 2013-10-06 22:44 +1100
          Re: How to streamingly read text file and display whenever updated text galeomaga@gmail.com - 2013-10-06 18:54 -0700
            Re: How to streamingly read text file and display whenever updated text Andreas Perstinger <andipersti@gmail.com> - 2013-10-07 11:52 +0200
  Re: How to streamingly read text file and display whenever updated text Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-10-05 12:08 +0100

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