New submission from Oz Tiram <nahu...@gmail.com>:
Considering that I want to build an CLI interactive program using cmd.Cmd,
which has multiple functions that accept two or more arguments,
I always have to do parsing of arg inside my do_methods for example:
class Calc(cmd.Cmd):
do_add(self, arg):
a, b = parse_ints(arg)
return a+b
do_mult(self, arg):
a, b = parse_ints(arg)
return a*b
This is easy enough for a simple calculator. But for more logic I need to
create more parse_type and explicitly call them at the top of each do_stuff.
Considering this I have created a patch for Cmd.cmd, that keeps the old
functionality, but adds the ability to pass multiple arguments without having
to parse them every time.
The functionality is as follows:
class MyProg(cmd.Cmd):
do_simple(self, arg):
print(arg)
do_greet(self, name="World")
print("Hello %s" %s)
do_add(self, a, b):
print(a+b)
Now in the cmd prompt:
(Cmd) simple foo
foo
(Cmd) # keeps the old functionallity
(Cmd) add 2 3
5
# add two properly add the values
(Cmd) add 2
# expects two arguments, so it will print the help for add
(Cmd) greet
Hello World
# does not complain because it has a default value
(Cmd) greet Guido
Hello Guido
(Cmd) greet name=Raymond
Hello Raymond
# works too
None of these example guess the type. It is simply handles as a string. but I
am playing around with automatically detecting types of variables using
function annotations in python 3.5 and later.
Also, although, not demonstrated here, one can also define:
def do_some_method_with_kwargs(self, arg1, arg2, **kwargs):
... do fancy stuff ...
(Cmd) some_method_with_kwargs foo bar kwargs='{"name": "John", "age"=35}'
kwargs is parsed to a dict (using json.loads) when escaped properly.
This is a bit esoteric, hence not shown here (but the patch patch includes it).
I was wondering if this kind of enhancement would be considered for this
module?
I will happily create a PR with tests and documentation explaining this
enhanced functionality.
----------
files: cmd.patch
keywords: patch
messages: 314968
nosy: Oz.Tiram
priority: normal
severity: normal
status: open
title: Cmd do_something only accepts one argument
Added file: https://bugs.python.org/file47520/cmd.patch
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<https://bugs.python.org/issue33227>
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