Call a function through a variable in Python

Question

I'm trying to make a game engine in Python as a "weekend project" but I have a problem.

I'm trying to make it that a user can declare a keybind by typing the key and the function into a text file what they want to run but when I run the code from that sheet with exec it runs the function and I have no idea on how to call the function through the variable. (Also I don't want it to run the function when it runs the code.)

Here is the code I use for executing the code from binds.zdata

for line in bind:
    try:
        exec line
    except:
        try:
            error.write(localtime + " : " + "ERROR: Could not bind key from the bind file : " + line)
        except:
            pass

Here's the text in binds.zdata

_w = Functions.motion.move().forward()
_a = Functions.motion.move().left()
_s = Functions.motion.move().back()
_d = Functions.motion.move().right()

Answer 1

You want to lose the () at the end of each line:

_w = Functions.motion.move().forward
_a = Functions.motion.move().left
_s = Functions.motion.move().back
_d = Functions.motion.move().right

now you can call the function through the variable by simply applying parenthesis, such as:

_w()

Answer 2

I'm not sure I recommend "exec" since somebody could put any code in there.

But here is your problem. _w = Functions.motion.move().forward() Calls the function 'forward' and puts the results in _w. _w = Functions.motion.move().forward Assigns the function 'forward' to the variable '_w'.

Since you asked what I would do, I would create a set of tokens that represent the various functions and then let them do the mapping in side a config file (see: ConfigParser). Then parse the config file. It is a little more work, but a lot more secure.