[Tutor] argparse iterable

[Mark Lawrence]

On 02/04/2013 01:31, kendy at kendy.org wrote:
> Dear Tutor
>
> I want to compare command line options, to options in a dictionary from a YAML
> file. The command line will over-ride the options in my file. (The YAML file, and
> its dictionary are not shown. That part works.)
>
> My distilled code:
>
> -------------------------------------------------------------------------
> $ cat h.py
> #!/usr/bin/python
>
> import argparse
> parser = argparse.ArgumentParser(description='Short sample app')
>
> def GetArgs(parser):
>      parser.add_argument('-a', action="store_true", default=False)
>      parser.add_argument('-b', action="store", dest="b")
>      parser.add_argument('-c', action="store", dest="c", type=int)
>      return parser
>
> GetArgs(parser)
>
> print(parser.parse_args())
> print("But this doesn't iter through a b and c:")
> for k,v in parser.parse_args():
>      print('This arg is %s %s' % k, k[str(v)])

for a in vars(parser.parse_args()):
     print('This arg is %s' % a)

http://docs.python.org/3/library/argparse.html#the-namespace-object

Please don't ask me for an explanation as it took me long enough to work 
this out from the docs :)

> $
> -------------------------------------------------------------------------
>
> My error:
> $ h.py -a -b hi -c 42
> Namespace(a=True, b='hi', c=42)
> But this doesn't iter through a b and c:
> Traceback (most recent call last):
>    File "./h.py", line 16, in <module>
>      for k,v in parser.parse_args():
> TypeError: 'Namespace' object is not iterable
> $
>
> How can I get parser to be iterable?
>
> After I get it to iter, I suppose that I'll be bitten by the boolean and integer
> type conversions. I'm not sure how to handle that either. Will 'str()' save me?
>
> Thanks a million (again!),
> Ken
>
>


-- 
If you're using GoogleCrap™ please read this 
http://wiki.python.org/moin/GoogleGroupsPython.

Mark Lawrence