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Date: Fri, 30 May 2014 19:48:17 +0530
Subject: Optparse to parsing Suggestions !!
From: Ganesh Pal <ganesh1pal@gmail.com>
To: python-list@python.org
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Hello Python world ,


I wanted suggestion on how to modify the below code to help me accomodate
the below two cases

# Here is the Sample code.

def main():
    """ ---MAIN--- """
    parser = optparse.OptionParser(usage='%prog [options] <arg1>.]',
version='1.0')
   object_choice = ('super_block','blocks''files', 'directory','links')

  parser.add_option("-o", "--object",
action="store",metavar="object",default='inode',dest="object",type='choice',
choices=object_choice,
                     help='The object type to be corrupted [ choose from ('
+ ','.join(object_choice) + ') default: %default]',)

    parser.add_option("-p",
"--path",action="store",metavar="/mnt/",dest="path",type="string",help="The
file or directory path in /mnt/",)

    parser.add_option("-n",
"--size",action="store",metavar="size",dest="size",default=1,type='int',help="The
offset field)


# Instruct optparse to parse the program's command line:
  (options, args) = parser.parse_args()

    # Build the dispatch table:
    object_type_dictionary = {
         "super_block":super_block_def,
         "blocks":blocks_def,
        "files": files_corrupt_def,
        "directory": directory_corrupt_def,
       "links": links_corrput_def, # no () here,we're storing function
    }

    # Lookup the object type and then call the function:
    object_type_dictionary[options.object]()


Sample Run
# python corrupt.py  --object=files --path=/tmp/ --size 1000


Questions :

Case 1:  #  The  --path is optional for few for the object type.  How do I
simulate the below behaviour

         #python corrupt.py  --object=super_block  --size=1000

          ==>  Should work even if --path is not given

         #python corrupt.py  --object=super_block  --path=/tmp/--size 1000

        ==>  If user enters --object=super_block and --path=/ifs/ should
throw an error

   saying its an invaild combinations.



case 2:  # The --path is mandatory for few of the object types and  should
complain if its not entered .

          # python corrupt.py  --object=files --path=/tmp/ --size 1000



Regards,
Ganesh

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Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr"><div><br></div><div>Hello Python world ,</div><div><br></d=
iv><div><br></div><div>I wanted suggestion on how to modify the below code =
to help me accomodate the below two cases</div><div><br></div><div># Here i=
s the Sample code.</div>
<div><br></div><div>def main():</div><div>=C2=A0 =C2=A0 &quot;&quot;&quot; =
---MAIN--- &quot;&quot;&quot;</div><div>=C2=A0 =C2=A0 parser =3D optparse.O=
ptionParser(usage=3D&#39;%prog [options] &lt;arg1&gt;.]&#39;, version=3D&#3=
9;1.0&#39;)</div><div>
=C2=A0 =C2=A0object_choice =3D (&#39;super_block&#39;,&#39;blocks&#39;&#39;=
files&#39;, &#39;directory&#39;,&#39;links&#39;)</div><div><br></div><div>=
=C2=A0 parser.add_option(&quot;-o&quot;, &quot;--object&quot;, action=3D&qu=
ot;store&quot;,metavar=3D&quot;object&quot;,default=3D&#39;inode&#39;,dest=
=3D&quot;object&quot;,type=3D&#39;choice&#39;, choices=3Dobject_choice,</di=
v>
<div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0help=3D&#39;The object type to be corrupted [ choose from (&#39; + &#=
39;,&#39;.join(object_choice) + &#39;) default: %default]&#39;,)</div><div>=
<br></div><div>=C2=A0 =C2=A0 parser.add_option(&quot;-p&quot;, &quot;--path=
&quot;,action=3D&quot;store&quot;,metavar=3D&quot;/mnt/&quot;,dest=3D&quot;=
path&quot;,type=3D&quot;string&quot;,help=3D&quot;The file or directory pat=
h in /mnt/&quot;,)</div>
<div><br></div><div>=C2=A0 =C2=A0 parser.add_option(&quot;-n&quot;, &quot;-=
-size&quot;,action=3D&quot;store&quot;,metavar=3D&quot;size&quot;,dest=3D&q=
uot;size&quot;,default=3D1,type=3D&#39;int&#39;,help=3D&quot;The offset fie=
ld)</div><div><br>
</div><div>=C2=A0</div><div># Instruct optparse to parse the program&#39;s =
command line:</div><div>=C2=A0 (options, args) =3D parser.parse_args()</div=
><div><br></div><div>=C2=A0 =C2=A0 # Build the dispatch table:</div><div>=
=C2=A0 =C2=A0 object_type_dictionary =3D {</div>
<div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&quot;super_block&quot;:super_block_=
def,</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&quot;blocks&quot;:blocks_=
def,</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 &quot;files&quot;: files_corrupt=
_def,</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 &quot;directory&quot;: director=
y_corrupt_def,</div>
<div>=C2=A0 =C2=A0 =C2=A0 =C2=A0&quot;links&quot;: links_corrput_def, # no =
() here,we&#39;re storing function</div><div>=C2=A0 =C2=A0 }</div><div><br>=
</div><div>=C2=A0 =C2=A0 # Lookup the object type and then call the functio=
n:</div><div>=C2=A0 =C2=A0 object_type_dictionary[options.object]()</div>
<div><br></div><div><br></div><div>Sample Run</div><div># python corrupt.py=
 =C2=A0--object=3Dfiles --path=3D/tmp/ --size 1000</div><div><br></div><div=
><br></div><div>Questions :</div><div>=C2=A0 =C2=A0=C2=A0</div><div>Case 1:=
 =C2=A0# =C2=A0The =C2=A0--path is optional for few for the object type. =
=C2=A0How do I simulate the below behaviour=C2=A0</div>
<div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0#python corrupt.py =C2=A0--object=3Dsuper_block =C2=A0--size=3D10=
00 =C2=A0=C2=A0</div><div><br></div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =3D=3D&gt; =C2=A0Should work even if --path is not given=C2=A0</div><div>=
=C2=A0 =C2=A0=C2=A0</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0#python cor=
rupt.py =C2=A0--object=3Dsuper_block =C2=A0--path=3D/tmp/--size 1000=C2=A0<=
/div>
<div><br></div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =3D=3D&gt; =C2=A0If user en=
ters --object=3Dsuper_block and --path=3D/ifs/ should throw an error</div><=
div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0saying its an=
 invaild combinations.</div>
<div>=C2=A0 =C2=A0 =C2=A0=C2=A0</div><div>=C2=A0 =C2=A0=C2=A0</div><div>=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0</div><div>case 2: =C2=A0# The --path is man=
datory for few of the object types and =C2=A0should complain if its not ent=
ered .</div><div>=C2=A0 =C2=A0=C2=A0</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 # python corrupt.py =C2=A0--object=3Dfiles --path=3D/tmp/ --size 100=
0</div>
<div>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0</div><div>=C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0</div><div><br></div><div>Regards,</div><div>Ganesh</div><div>=C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0</div><div>=C2=A0 =C2=A0=C2=A0</div></div>

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