naming variables from string

Question

mabe I'm asking for too much, but, is there possibility to create variable for instantiating class with name from another string variable?

something like this:

 name = 'my_class_instance' # string variable holding name

 my_class_instance = my_cool_class(arg1, arg2, arg3)  #instance of a class in variable with name from string

br, Ivica

Possible? yes. But unless you have a very good reason to do so, it's a bad idea. Most cases where someone thinks they need dynamically named variables are better served by using the right data types such as dictionaries. — l4mpi
– l4mpi, Commented Feb 24, 2021 at 12:23

milanbalazs · Accepted Answer · 2021-02-24 19:25:10Z

1

First of all, I have to say it is very-very dangerous and not recommended to do that.

But you can do it with exec function. You can find more info about it on this page.

I have written a representative code for you.

Code:

name = "my_class_instance"


class MyCoolClass(object):
    def __init__(self, arg1, arg2, arg3):
        self.arg1 = arg1
        self.arg2 = arg2
        self.arg3 = arg3

    def print_args(self):
        print(self.arg1)
        print(self.arg2)
        print(self.arg3)


exec(
    "{var_name} = MyCoolClass({arg1}, {arg2}, {arg3})".format(
        var_name=name, arg1="'test_1'", arg2="'test_2'", arg3="'test_3'"
    )
)

my_class_instance.print_args()

Output:

>>> python3 test.py
test_1
test_2
test_3

answered Feb 24, 2021 at 19:25

milanbalazs

5,3895 gold badges32 silver badges52 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

naming variables from string

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related