Calling a method from all the instances of a class

Question

This question may sound a little weird, but I have been unable to find the answer so far, and I decided to ask here:

Is there a way to call a method from all the instances of a class without having to loop through each and every single instance manually?

Example:

Normally, I would do something like this:

instList = []

class SomeClass:
    def __init__(self,*args,**kwargs):
        #init stuff
        
        instList.append(self)

    def theThing(self):
        #do the thing

def allTheThings(il):
    for inst in il:
        inst.theThing()

allTheThings(instList)

This works pretty well normally, but it doesn't seem very efficient. Is there some way to streamline this into one or two lines of code?

Something like this:

class SomeClass:
    def __init__(self,*args,**kwargs):
        #init stuff

    def theThing(self):
        #do the thing

SomeClass.instances.theThing()

or this:

class SomeClass:
    def __init__(self,*args,**kwargs):
        #init stuff

    def theThing(self):
        #do the thing

instancesOf(SomeClass).theThing()

This would be really helpful, as I plan on using this in many different ways: auto-killing everything at the end of a game, detecting various polygon-shaped buttons being clicked, anything that involves calling a single method on a bunch of instances.