Re: cmd all commands method?
En Mon, 19 Feb 2007 00:08:45 -0300, placid <[EMAIL PROTECTED]> escribió:
> If anyone can provide a suggestion to replicate the following Tcl
> command in Python, i would greatly appreciate it.
>
> namespace eval foo {
> variable bar 12345
> }
>
> what this does is create a namespace foo with the variable bar set to
> 12345.
Python namespaces are simple dictionaries. See the eval function.
py> s = "3+x**2"
py> freevars = {"x": 2}
py> eval(s, {}, freevars)
7
--
Gabriel Genellina
--
http://mail.python.org/mailman/listinfo/python-list
Re: cmd all commands method?
On Feb 18, 8:59 pm, "Michele Simionato" <[EMAIL PROTECTED]>
wrote:
> On Feb 18, 10:49 am, "placid" <[EMAIL PROTECTED]> wrote:
>
> > On Feb 18, 7:17 pm, "Michele Simionato" <[EMAIL PROTECTED]>
>
> > > Yes, he is talking about the cmd
> > > module:http://docs.python.org/dev/lib/Cmd-objects.html.
> > > However that module was never intended as a real interpreter, so
> > > defining variables
> > > as the OP wants would require some work.
>
> > > Michele Simionato
>
> > How much work does it require ?
>
> Have you ever written an interpreter? It is a nontrivial job.
>
> Michele Simionato
No i have never written an interpreter and i can just imagine how much
work/effort is needed to write something like that.
If anyone can provide a suggestion to replicate the following Tcl
command in Python, i would greatly appreciate it.
namespace eval foo {
variable bar 12345
}
what this does is create a namespace foo with the variable bar set to
12345.
http://aspn.activestate.com/ASPN/docs/ActiveTcl/8.4/tcl/TclCmd/variable.htm
The code provided by Peter Otten is a good start for me. Cheers for
that!
Cheers
--
http://mail.python.org/mailman/listinfo/python-list
Re: cmd all commands method?
On Feb 18, 10:49 am, "placid" <[EMAIL PROTECTED]> wrote: > On Feb 18, 7:17 pm, "Michele Simionato" <[EMAIL PROTECTED]> > > > Yes, he is talking about the cmd > > module:http://docs.python.org/dev/lib/Cmd-objects.html. > > However that module was never intended as a real interpreter, so > > defining variables > > as the OP wants would require some work. > > > Michele Simionato > > How much work does it require ? Have you ever written an interpreter? It is a nontrivial job. Michele Simionato -- http://mail.python.org/mailman/listinfo/python-list
Re: cmd all commands method?
placid wrote:
> On Feb 18, 7:17 pm, "Michele Simionato" <[EMAIL PROTECTED]>
> wrote:
>> On Feb 17, 11:44 pm, Bjoern Schliessmann >
>>
>>
>> [EMAIL PROTECTED]> wrote:
>> > placid wrote:
>> > > if i want to treat every cmdloop prompt entry as a potential
>> > > command then i need to overwrite the default() method ?
>>
>> > Excuse me, what's a cmdloop prompt? What's the "default() method"?
>>
>> > > What i want to achieve is to be able to support global variable
>> > > creation for example;
>>
>> > > res = sum 1 2
>>
>> > > this would create a variable res with the result of the method
>> > > do_sum() ?
>>
>> > > then would i be able to run;
>>
>> > > sum a 5
>>
>> > > this would return 8 or an error saying that res is not defined
>>
>> > Are you sure you're talking about Python here?
>>
>> Yes, he is talking about the cmd
>> module:http://docs.python.org/dev/lib/Cmd-objects.html. However that
>> module was never intended as a real interpreter, so defining variables
>> as the OP wants would require some work.
>>
>> Michele Simionato
>
> How much work does it require ?
Too much. However, here's how far I got:
import cmd
import shlex
DEFAULT_TARGET = "_"
def number(arg):
for convert in int, float:
try:
return convert(arg)
except ValueError:
pass
return arg
class MyCmd(cmd.Cmd):
def __init__(self, *args, **kw):
cmd.Cmd.__init__(self, *args, **kw)
self.namespace = {}
self.target = DEFAULT_TARGET
def precmd(self, line):
parts = line.split(None, 2)
if len(parts) == 3 and parts[1] == "=":
self.target = parts[0]
return parts[2]
self.target = DEFAULT_TARGET
return line
def resolve(self, arg):
args = shlex.split(arg)
result = []
for arg in args:
try:
value = self.namespace[arg]
except KeyError:
value = number(arg)
result.append(value)
return result
def calc(self, func, arg):
try:
result = self.namespace[self.target] = func(self.resolve(arg))
except Exception, e:
print e
else:
print result
def do_sum(self, arg):
self.calc(sum, arg)
def do_max(self, arg):
self.calc(max, arg)
def do_print(self, arg):
print " ".join(str(arg) for arg in self.resolve(arg))
def do_values(self, arg):
pairs = sorted(self.namespace.iteritems())
print "\n".join("%s = %s" % nv for nv in pairs)
def do_EOF(self, arg):
return True
if __name__ == "__main__":
c = MyCmd()
c.cmdloop()
Peter
--
http://mail.python.org/mailman/listinfo/python-list
Re: cmd all commands method?
On Feb 18, 7:17 pm, "Michele Simionato" <[EMAIL PROTECTED]> wrote: > On Feb 17, 11:44 pm, Bjoern Schliessmann > > > [EMAIL PROTECTED]> wrote: > > placid wrote: > > > if i want to treat every cmdloop prompt entry as a potential > > > command then i need to overwrite the default() method ? > > > Excuse me, what's a cmdloop prompt? What's the "default() method"? > > > > What i want to achieve is to be able to support global variable > > > creation for example; > > > > res = sum 1 2 > > > > this would create a variable res with the result of the method > > > do_sum() ? > > > > then would i be able to run; > > > > sum a 5 > > > > this would return 8 or an error saying that res is not defined > > > Are you sure you're talking about Python here? > > Yes, he is talking about the cmd > module:http://docs.python.org/dev/lib/Cmd-objects.html. > However that module was never intended as a real interpreter, so > defining variables > as the OP wants would require some work. > > Michele Simionato How much work does it require ? -- http://mail.python.org/mailman/listinfo/python-list
Re: cmd all commands method?
On Feb 17, 11:44 pm, Bjoern Schliessmann wrote: > placid wrote: > > if i want to treat every cmdloop prompt entry as a potential > > command then i need to overwrite the default() method ? > > Excuse me, what's a cmdloop prompt? What's the "default() method"? > > > What i want to achieve is to be able to support global variable > > creation for example; > > > res = sum 1 2 > > > this would create a variable res with the result of the method > > do_sum() ? > > > then would i be able to run; > > > sum a 5 > > > this would return 8 or an error saying that res is not defined > > Are you sure you're talking about Python here? Yes, he is talking about the cmd module: http://docs.python.org/dev/lib/Cmd-objects.html. However that module was never intended as a real interpreter, so defining variables as the OP wants would require some work. Michele Simionato -- http://mail.python.org/mailman/listinfo/python-list
Re: cmd all commands method?
placid wrote: > if i want to treat every cmdloop prompt entry as a potential > command then i need to overwrite the default() method ? Excuse me, what's a cmdloop prompt? What's the "default() method"? > What i want to achieve is to be able to support global variable > creation for example; > > res = sum 1 2 > > this would create a variable res with the result of the method > do_sum() ? > > then would i be able to run; > > sum a 5 > > this would return 8 or an error saying that res is not defined Are you sure you're talking about Python here? Regards, Björn -- BOFH excuse #7: poor power conditioning -- http://mail.python.org/mailman/listinfo/python-list
Re: cmd all commands method?
placid wrote: > Hi all, > > if i want to treat every cmdloop prompt entry as a potential command > then i need to overwrite the default() method ? > > What i want to achieve is to be able to support global variable > creation for example; > > res = sum 1 2 > > this would create a variable res with the result of the method > do_sum() ? > > then would i be able to run; > > sum a 5 this should have been, sum res 5 > > this would return 8 or an error saying that res is not defined > > > Cheers -- http://mail.python.org/mailman/listinfo/python-list
cmd all commands method?
Hi all, if i want to treat every cmdloop prompt entry as a potential command then i need to overwrite the default() method ? What i want to achieve is to be able to support global variable creation for example; res = sum 1 2 this would create a variable res with the result of the method do_sum() ? then would i be able to run; sum a 5 this would return 8 or an error saying that res is not defined Cheers -- http://mail.python.org/mailman/listinfo/python-list
