Save input into script

[longtomjr]

I am making a basic comand line program that does conversions in python and i want to add more conversions to it without scripting. so you can command the program something like

(you command the PC)     add new_conversion
(The PC ask)       name the new_conversion: *here you enter your function name*
ect.

then in the end you get a function like this:

def kiloMile(n, km):
    if type(n) != int:
            return "Error 1", "Unexpected variable."
    elif km == "k":
        mile = n * 0.621371
        return mile
    elif km == "m":
        kilometers = n * 1.60934
        return kilometers
    else:
        return "Error 1", "Unexpected variable."

is this posible to edit the program through the program.

thanks in advance
LTJR

[Lardmeister]

It should be possible, but would anybody trust the program after a while?
I can see a dictionary with lambda functions, that can be pickled to save it.

[longtomjr]

would anybody trust the program after a while?

It is just to add your own conversions I would say, otherwise i can create some sort of function that place all the custom conversions in a conf file.

[Lardmeister]

For the typical use of a dictionary for converions see:
http://www.daniweb.com/software-development/python/code/216591/area-unit-conversion-python

[longtomjr]

i do this acctualy to practice my skills... and learn new stuf... Yes I do think the Dictionary aproach is way better byt I like to make my own stuff one in a while... You dont need to reinvent the wheel but you must build your own to understand the tools better

[ZZucker]

You need to save your updates and a dictionary is ideal to do this with. Python has module shelve to make a 'persistent to file' dictionary automatically. Very powerful stuff indeed!