On Thursday, April 13, 2017 at 12:38:48 PM UTC+10, MRAB wrote:
> On 2017-04-13 02:59, ian.steg...@gmail.com wrote:
> > I have this code which I got from
> > https://www.tutorialspoint.com/python/python_command_line_arguments.htm The
> > example works fine but when I modify it to what I need, it only half works.
> > The problem is the try/except. If you don't specify an input/output, they
> > are blank at the end but it shouldn't be.
> >
> >
> > import getopt
> > import sys
> >
> > def main(argv):
> > inputfile = ''
> > outputfile = ''
> > try:
> >opts, args = getopt.getopt(argv,"hi:o:",["ifile=","ofile="])
> > except getopt.GetoptError:
> >inputfile = 'Input'
> >outputfile = 'Output'
> > if inputfile == '':
> >for opt, arg in opts:
> > if opt == '-h':
> > print ('Usage: Encrypt.py -i -o ')
> > sys.exit()
> > elif opt in ("-i", "--ifile"):
> > inputfile = arg
> > elif opt in ("-o", "--ofile"):
> > outputfile = arg
> > else:
> >''
> >
> > print 'In: ' + inputfile
> > print 'Out: ' + outputfile
> >
> > if __name__ == "__main__":
> > main(sys.argv[1:])
> >
> You'll get the GetoptError exception if an option that requires an
> argument doesn't have one. That's not the same as omitting the option
> entirely.
>
> For example:
>
> # No -i option.
> foo
>
> # Option -i present but without its required argument.
> foo -i
WOW. Thanks for that.
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