Re: Python Command Line Arguments

[breamoreboy]

On Saturday, April 15, 2017 at 6:45:51 PM UTC+1, Grant Edwards wrote:
> On 2017-04-14, Bernd Nawothnig wrote:
> 
> > He should switch to argparse in any case because getopt is no longer
> > supported and does only receive bugfixes.
> 
> In my book, "receiving bug fixes" means it's still supported.
> 
> --
> Grant

Just to reinforce what I said before, optparse is deprecated, not getopt.

Kindest regards.

Mark Lawrence.
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Re: Python Command Line Arguments

[breamoreboy]

On Friday, April 14, 2017 at 2:44:09 PM UTC+1, Bernd Nawothnig wrote:
> On 2017-04-13, Jason Friedman 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
> >
> > I am guessing you are wanting to parse command-line arguments rather than
> > particularly wanting to use the getopt module.
> > If I am correct you might want to spend your time instead learning the
> > argparse module:
> > https://docs.python.org/3/library/argparse.html
> > https://docs.python.org/3/howto/argparse.html
> 
> He should switch to argparse in any case because getopt is no longer
> supported and does only receive bugfixes.
> 
> Bernd
> 
> -- 
> Die Antisemiten vergeben es den Juden nicht, dass die Juden ‘Geist’
> haben – und Geld. Die Antisemiten – ein Name der
> ‘Schlechtweggekommenenen’ [Friedrich Nietzsche]

optparse is deprecated, not getopt.

Kindest regards.

Mark Lawrence.
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Re: Python Command Line Arguments

[Grant Edwards]

On 2017-04-14, Bernd Nawothnig  wrote:

> He should switch to argparse in any case because getopt is no longer
> supported and does only receive bugfixes.

In my book, "receiving bug fixes" means it's still supported.

--
Grant

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Re: Python Command Line Arguments

[Bernd Nawothnig]

On 2017-04-13, Jason Friedman 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
>
> I am guessing you are wanting to parse command-line arguments rather than
> particularly wanting to use the getopt module.
> If I am correct you might want to spend your time instead learning the
> argparse module:
> https://docs.python.org/3/library/argparse.html
> https://docs.python.org/3/howto/argparse.html

He should switch to argparse in any case because getopt is no longer
supported and does only receive bugfixes.




Bernd

-- 
Die Antisemiten vergeben es den Juden nicht, dass die Juden ‘Geist’
haben – und Geld. Die Antisemiten – ein Name der
‘Schlechtweggekommenenen’ [Friedrich Nietzsche]
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Re: Python Command Line Arguments

[ian . stegner]

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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Re: Python Command Line Arguments

[MRAB]

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
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Re: Python Command Line Arguments

[Jason Friedman]

>
> 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
>

Hello Ian,
I am guessing you are wanting to parse command-line arguments rather than
particularly wanting to use the getopt module.
If I am correct you might want to spend your time instead learning the
argparse module:
https://docs.python.org/3/library/argparse.html
https://docs.python.org/3/howto/argparse.html
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Python Command Line Arguments

[ian . stegner]

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:])
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