Running command from user input

Question

I am wanting to create a CLI that will accept input from the user and run commands based on what they input.

def apple():
    print("Apple")

def orange():
    print("Orange")

def grape():
    print("Grape")


userinput = input("Which function do you want to run? ")

userinput()

What I am trying to get to work is, when the user enters "Orange" it will print Orange. Same for apple and grape. My real project will incorporate a lot more functions the user can input but this is the part I am stuck on at the moment.

Combine this with this (mostly the second one), and you're good to go. — Mad Physicist
– Mad Physicist, Commented Feb 12, 2019 at 16:28
@AzatIbrakov. I'd go with globals since you're eventually going to want to stick that into a function, but same difference. — Mad Physicist
– Mad Physicist, Commented Feb 12, 2019 at 16:28
@MadPhysicist: sure, I've used vars because it was shorter and in given context will behave like globals (but globals obviously is a correct choice) — Azat Ibrakov
– Azat Ibrakov, Commented Feb 12, 2019 at 16:30

Tom Gringauz · Accepted Answer · 2019-02-12 16:40:54Z

1

If I understood you correctly, here's how I would implement something like that:

class Commands:
    @staticmethod
    def _apple():
        print("Apple")

    @staticmethod
    def _orange():
        print("Orange")

    @staticmethod
    def _grape():
        print("Grape")

    def run(self, cmd_name):
        getattr(Commands, '_' + cmd_name.lower())()

You can then run it with Commands.run(input())

answered Feb 12, 2019 at 16:40

Tom Gringauz

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1 Comment

Doritos Over a year ago

Yes this is exactly what I was wanting. i was looking into the getattr command but I wasn't fully understanding it. This helps to understand.

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