I have this script main.py:

class Test:
    def __init__(self):
        
        self.arg = 'argg!!!'
    
    def meth_1(self , arg):
        
        print(arg + self.arg)
        
        

a = Test()

a.meth_1('po')

#### poargg!!!


def meth_2(self, arg):
    
    print(3*arg + self.arg)
    
    
Test.meth_1 = meth_2


b = Test()

b.meth_1('lo')

#### lololoargg!!!



class Test2:
    def __init__(self):
        
        self.arg = 'argg!!!'
        
        self.meth_1 = meth_2
        
        
c = Test2()

c.meth_1('ho') #TypeError: meth_2() missing 1 required positional argument: 'arg'if def meth_2(self, arg):
               # TypeError: meth_2() takes 1 positional argument but 2 were given if def meth_2(arg):

Is there any way to add a function to a class as method at __init__ making it access class attributes ? If not why ? That is in my case have c.meth_1('ho') working ? Sorry for the poor phrasing of my question I am a Python newbie