Re: cmd with three arguments

2010-05-17 Thread Tim Chase 

On 05/17/2010 07:11 AM, kak...@gmail.com wrote:

While playing with the Python Standard Library, i came across cmd.
So I'm trying to make a console application. Everything works fine, i
created many function with do_(self, line) prefix, but when i
tried to create a function with more arguments
  i can't make it work.  e.g
def do_connect(self, ip, command):


connect 127.0.0.1 delete

  Are there any work arounds


You simply receive all the text after the command:

  class C(Cmd):
def do_thing(self, arguments):
  print repr(arguments)

If you want to split it, you can do it boringly:

def do_thing(self, arguments):
  args = arguments.split()

or you can let Python's standard library do some heavy-lifting 
for you:


  import shlex
  #...
def do_thing(self, arguments):
  args = shlex.split(arguments)

-tkc



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Re: cmd with three arguments

2010-05-17 Thread kak...@gmail.com 
On May 17, 4:12 pm, Tim Chase python.l...@tim.thechases.com wrote:
 On 05/17/2010 07:11 AM, kak...@gmail.com wrote:

  While playing with the Python Standard Library, i came across cmd.
  So I'm trying to make a console application. Everything works fine, i
  created many function with do_(self, line) prefix, but when i
  tried to create a function with more arguments
    i can't make it work.  e.g
  def do_connect(self, ip, command):

  connect 127.0.0.1 delete
    Are there any work arounds

 You simply receive all the text after the command:

    class C(Cmd):
      def do_thing(self, arguments):
        print repr(arguments)

 If you want to split it, you can do it boringly:

      def do_thing(self, arguments):
        args = arguments.split()

 or you can let Python's standard library do some heavy-lifting
 for you:

    import shlex
    #...
      def do_thing(self, arguments):
        args = shlex.split(arguments)

 -tkc

Thanks, great answer!!!
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Re: cmd with three arguments

2010-05-17 Thread Peter Otten 
kak...@gmail.com wrote:

 Hi pythonistas,
 While playing with the Python Standard Library, i came across cmd.
 So I'm trying to make a console application. Everything works fine, i
 created many function with do_(self, line) prefix, but when i
 tried to create a function with more arguments
  i can't make it work.  e.g
 def do_connect(self, ip, command):
 
 connect 127.0.0.1 delete
  Are there any work arounds
 
 Thanks in advance
 
 Antonis

You have to split the user input into arguments yourself. You can do this in 
the body of the do_xxx() methods, use a decorator, or subclass cmd.Cmd.

Here's a solution using a decorator:

import cmd
import inspect
import shlex

def split(f):
def g(self, line):
argvalues = shlex.split(line)
argnames = inspect.getargspec(f).args
argcount = len(argnames) - 1
if len(argvalues) != argcount:
print Need exactly %d args % argcount
return
return f(self, *argvalues)
return g

class Cmd(cmd.Cmd):
@split
def do_connect(self, ip, command):
print ip=%r, command=%r % (ip, command)


if __name__ == __main__:
c = Cmd()
c.cmdloop()

And here's a subclass that avoids the need for explicit @split decorations:

import cmd
import inspect
import shlex

def split(f):
def g(line):
argvalues = shlex.split(line)
argnames = inspect.getargspec(f).args
argcount = len(argnames) -1
if len(argvalues) != argcount:
print Need exactly %d args % argcount
return
return f(*argvalues)
return g

class CmdBase(cmd.Cmd, object):
def __getattribute__(self, name):
attr = object.__getattribute__(self, name)
if name.startswith(do_):
attr = split(attr)
return attr

class Cmd(CmdBase):
def do_connect(self, ip, command):
print ip=%r, command=%r % (ip, command)


if __name__ == __main__:
c = Cmd()
c.cmdloop()

Now you've got an idea of the general direction you can certainly come up 
with something less hackish ;)

Peter
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Re: cmd with three arguments

2010-05-17 Thread kak...@gmail.com 
On May 17, 4:34 pm, Peter Otten __pete...@web.de wrote:
 kak...@gmail.com wrote:
  Hi pythonistas,
  While playing with the Python Standard Library, i came across cmd.
  So I'm trying to make a console application. Everything works fine, i
  created many function with do_(self, line) prefix, but when i
  tried to create a function with more arguments
   i can't make it work.  e.g
  def do_connect(self, ip, command):

  connect 127.0.0.1 delete
   Are there any work arounds

  Thanks in advance

  Antonis

 You have to split the user input into arguments yourself. You can do this in
 the body of the do_xxx() methods, use a decorator, or subclass cmd.Cmd.

 Here's a solution using a decorator:

 import cmd
 import inspect
 import shlex

 def split(f):
     def g(self, line):
         argvalues = shlex.split(line)
         argnames = inspect.getargspec(f).args
         argcount = len(argnames) - 1
         if len(argvalues) != argcount:
             print Need exactly %d args % argcount
             return
         return f(self, *argvalues)
     return g

 class Cmd(cmd.Cmd):
     @split
     def do_connect(self, ip, command):
         print ip=%r, command=%r % (ip, command)

 if __name__ == __main__:
     c = Cmd()
     c.cmdloop()

 And here's a subclass that avoids the need for explicit @split decorations:

 import cmd
 import inspect
 import shlex

 def split(f):
     def g(line):
         argvalues = shlex.split(line)
         argnames = inspect.getargspec(f).args
         argcount = len(argnames) -1
         if len(argvalues) != argcount:
             print Need exactly %d args % argcount
             return
         return f(*argvalues)
     return g

 class CmdBase(cmd.Cmd, object):
     def __getattribute__(self, name):
         attr = object.__getattribute__(self, name)
         if name.startswith(do_):
             attr = split(attr)
         return attr

 class Cmd(CmdBase):
     def do_connect(self, ip, command):
         print ip=%r, command=%r % (ip, command)

 if __name__ == __main__:
     c = Cmd()
     c.cmdloop()

 Now you've got an idea of the general direction you can certainly come up
 with something less hackish ;)

 Peter

Thanks great advice!
Antonis
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