python command-line-style application with tkinter

Question

In the application I'm currently working on, i want to include a feature in which the administrator has access to a sort of command line.
This is not the actual command line, instead it looks for keywords inside a Textbox that I define, and runs their linked functions with the input parameters.
For instance:

get user data: erikthered

...would run the method self.user_data('erikthered'), but I'm unsure how to get to this step elegantly, without using messy things like eval or exec.
These features should ideally also work for multiple parameters.
I apologise if this question is considered subjective, but I haven't really programmed something like this before, and I value other people's insights.
Thanks

UPDATE One way to do this, using exec, is to use a dictionary, like so:

    links = {'get users':'self.get_users(parameters)', 'get user data':'self.get_user_data(parameters)'}

    terminal = self.terminal
    line = str(terminal.index(INSERT).split('.')[0])
    #get index of line

    line = terminal.get(line+'.0', line+'.end')
    splitline = line.split(':')

    command = splitline[0]
    parameters = splitline[1].split(',')
    exec(links[command])

This is the code I have to get the text that the user has typed, bound to a return press. But I would prefer not to use exec.

Does this question have anything to do with Tkinter or the actual command-line, or is this purely about how to parse and evaluate some made up command language? — tobias_k
– tobias_k, Commented Jan 18, 2017 at 10:24
You're right, it probably has more to do with parsing the inputs, than tkinter or the actual command-line — EriktheRed
– EriktheRed, Commented Jan 18, 2017 at 10:27

j_4321 · Accepted Answer · 2017-01-18 12:09:15Z

1

If you don't want to use exec, you can do a dictionary of functions:

def get_user_data(*args):
    print(*args)
# dictionary of functions
functions = {'get user data': get_user_data}

line = "get user data: erikthered, turtle"

# parse line
command, params = line.split(":")
params = [p.strip() for p in params.split(",")]
functions[command](*params)

answered Jan 18, 2017 at 12:09

j_4321

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2 Comments

EriktheRed Over a year ago

out of interest, would params.replace(" ", "").split(","), instead of the list comp, also work?

j_4321 Over a year ago

In this case, there will be problems with arguments containing spaces, e.g. "green turtle" will become "greenturtle".

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