Input from a file as a command line argument

John Machin sjmachin at lexicon.net
Sat Apr 5 23:26:37 CEST 2003


Teemu Luojola <teemu.luojola at pbezone.net> wrote in message news:<3E8EDBDA.7020701 at pbezone.net>...
> If I make an executable script in linux environment, how can I pass 
> input to that script from a file on command line? Like the following:
> 
> $ script.py input.txt

import sys
file_name = sys.argv[1]
file_handle = file(file_name)
for line in file_handle:
   print line
file_handle.close()

> or perhaps
> 
> $ script.py < input.txt

import sys
for line in sys.stdin:
   print line

Notes: (1) This will work with Windows too. (2) The above is written
for Python version 2.2 (the latest production release) -- if you have
only an earlier version, (like 1.5.2), you may like to read back
through the "What's new in Python x.y" series on www.python.org to see
what you are missing. (3) Unless you are forced to by inability to
upgrade your Python version, or a need to read another's code, you
don't need to know about xreadlines() -- the "for line in file_object"
paradigm is the thoroughly modern way.

HTH,
John




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