Re: Question About Command line arguments

[MRAB]

On 10/06/2011 18:21, Mark Phillips wrote:

I have a script that processes command line arguments

def main(argv=None):
     syslog.syslog("Sparkler stared processing")
     if argv is None:
         argv = sys.argv
     if len(argv) != 2:
         syslog.syslog(usage())
     else:
         r = parseMsg(sys.argv[1])
         syslog.syslog(r)
     return 0

if __name__ == "__main__":
     sys.exit(main())

When I run "python myscript fred" it works as expected - the argument
fred is processed in parseMsg as sys.arv[1]

When I run "echo fred | python myscript" the script thinks there are no
arguments, so it prints out the usage statement.

Is the problem with the echo command, or how I wrote my script?

In the second case, there aren't any arguments. The echo command is
writing "fred" to its standard output, which is attached to your
script's standard input.
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