to pass self or not to pass self

[lallous]

Hello,

Learning Python from the help file and online resources can leave one
with many gaps. Can someone comment on the following:

# ---------
class X:
    T = 1

    def f1(self, arg):
        print "f1, arg=%d" % arg
    def f2(self, arg):
        print "f2, arg=%d" % arg
    def f3(self, arg):
        print "f3, arg=%d" % arg

    # this:
    F = f2
    # versus this:
    func_tbl = { 1: f1, 2: f2, 3: f3 }

    def test1(self, n, arg):
        # why passing 'self' is needed?
        return self.func_tbl[n](self, arg)

    def test2(self):
        f = self.f1
        f(6)

        f = self.F
        # why passing self is not needed?
        f(87)

# ---------
x = X()

x.test1(1, 5)
print '----------'
x.test2()

Why in test1() when it uses the class variable func_tbl we still need
to pass self, but in test2() we don't ?

What is the difference between the reference in 'F' and 'func_tbl' ?

Thanks,
Elias