Hi everyone I want to ask about class.

What difference is:

class Test:
    l = ['a', 'b', 'c']
    def __init__(self):
        pass
    def t(self, a):
        if a in self.l:
            pass

and here:

class Test:
    l = ['a', 'b', 'c']
    def __init__(self):
        pass
    def t(self, a):
        if a in Test.l:
            pass

And why should I use version with self?