cmd module question

Daniel Dittmar daniel.dittmar at sap.com
Fri May 18 10:27:03 CEST 2001


>   File "/usr/local/lib/python2.1/cmd.py", line 124, in onecmd
>     return func(arg)
> TypeError: do_get() takes exactly 1 argument (2 given)
>
>
> I've run my code through the interpeter and read through the cmd.py module
> file to figure out what I'm doing wrong..  I can't seem to locate where
> it's sending 2 args.

All do_* methods must be declared as

def do_something (self, strarg = None):

strarg will contain the remainder of the input.

You don't see a call with two argumentes because of the line

func = getattr(self, 'do_' + cmd)    # in cmd.py

The callable object returned from getattr is already bound to your object,
so the self parameter is implicit in the call.

Daniel
--
Daniel Dittmar
daniel.dittmar at sap.com
SAP DB, SAP Labs Berlin
http://www.sapdb.org/

<jedi at ccrypt.net> wrote in message
news:mailman.990166766.17981.python-list at python.org...
> Hi there.  Newbie for both python and programming in general.
>
> I'm writing a simple mail client and I've hitting a snag.  I've written
> the following function to get mail from the unix mail file and dump each
> message into a list:
>
> def do_get(self):
> while 1:
> msg = mb.next()
> if not msg:
> break
> msg["body"] = msg.fp.read()
> list.append(msg)
>
> I get the following error when I test it:
>
> bash-2.05$ python read.py
> Reader:get
> Traceback (most recent call last):
>   File "read.py", line 36, in ?
>     read.cmdloop()
>   File "/usr/local/lib/python2.1/cmd.py", line 86, in cmdloop
>     stop = self.onecmd(line)
>   File "/usr/local/lib/python2.1/cmd.py", line 124, in onecmd
>     return func(arg)
> TypeError: do_get() takes exactly 1 argument (2 given)
>
>
> I've run my code through the interpeter and read through the cmd.py module
> file to figure out what I'm doing wrong..  I can't seem to locate where
> it's sending 2 args.
>
> TIA
>
> Below is the full code:
>
> #!/usr/local/bin/python
>
> import cmd
> import mailbox
>
> userbox='/var/mail/jedi'
> list=[]
> mb=mailbox.UnixMailbox(open(userbox))
>
> class Reader(cmd.Cmd):
>
>         def __init__(self):
>                 cmd.Cmd.__init__(self)
>                 self.prompt = "Reader:"
>
>         def help_get(self):
>                 print "Gets all the messages in your mailbox."
>
>         def do_get(self):
>                 while 1:
>                         msg = mb.next()
>                         if not msg:
>                                 break
>                         msg["body"] = msg.fp.read()
>                         list.append(msg)
>
>         def help_quit(self):
>                 print "Quits you out of Reader."
>
>         def do_quit(self, line):
>                 print "Exiting..."
>                 sys.exit()
>
> if __name__ == '__main__':
>         readbox = Reader()
>         readbox.cmdloop()
>
>
>





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