problem with optparse

Neal Becker ndbecker2 at gmail.com
Wed Dec 3 01:47:52 CET 2008


Robert Kern wrote:

> Neal Becker wrote:
>> This example is right out of python library reference.  What's wrong
>> here?
>> 
>> import optparse
>> 
>> def store_value(option, opt_str, value, parser):
>>     setattr(parser.values, option.dest, value)
>> 
>> parser = optparse.OptionParser()
>> parser.add_option("--foo",
>>                   action="callback", callback=store_value,
>>                   type="int", nargs=3, dest="foo")
>> 
>> (opt,args) = parser.parse_args ('--foo a b c'.split())
>> 
>> [...]
>> /usr/lib64/python2.5/optparse.pyc in _process_args(self, largs, rargs,
>> values)
>>    1423             elif self.allow_interspersed_args:
>>    1424                 largs.append(arg)
>> -> 1425                 del rargs[0]
>>    1426             else:
>>    1427                 return                  # stop now, leave this
>>    arg in rargs
>> 
>> TypeError: 'str' object doesn't support item deletion
> 
> Dunno. It works for me (i.e. I get the expected "error: option --foo:
> invalid integer value: 'a'"). Have you tried it outside of IPython?
> 
yes:
python test_opt.py 
Traceback (most recent call last):
  File "test_opt.py", line 12, in <module>
    (opt,args) = parser.parse_args ('--foo')
  File "/usr/lib64/python2.5/optparse.py", line 1378, in parse_args
    stop = self._process_args(largs, rargs, values)
  File "/usr/lib64/python2.5/optparse.py", line 1425, in _process_args
    del rargs[0]
TypeError: 'str' object doesn't support item deletion




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