Let me introduce: __slots__(chrisbarra.xyz)

    from collections import namedtuple
    
    STest = namedtuple("TEST", "a b c")
    a = STest(a=1,b=2,c=3)

    class Test(object):
        __slots__ = ["a","b","c"]

        a=1
        b=2
        c=3
    
    b = Test()
    
    c = {'a':1, 'b':2, 'c':3}
    
    d = (1,2,3)
    e = [1,2,3]
    f = (1,2,3)
    g = [1,2,3]
    key = 2
    
    if __name__ == '__main__':
        from timeit import timeit
    
        print("Named tuple with a, b, c:")
        print(timeit("z = a.c", "from __main__ import a"))
    
        print("Named tuple, using index:")
        print(timeit("z = a[2]", "from __main__ import a"))
    
        print("Class using __slots__, with a, b, c:")
        print(timeit("z = b.c", "from __main__ import b"))
    
        print("Dictionary with keys a, b, c:")
        print(timeit("z = c['c']", "from __main__ import c"))
    
        print("Tuple with three values, using a constant key:")
        print(timeit("z = d[2]", "from __main__ import d"))
    
        print("List with three values, using a constant key:")
        print(timeit("z = e[2]", "from __main__ import e"))
    
        print("Tuple with three values, using a local key:")
        print(timeit("z = d[key]", "from __main__ import d, key"))
    
        print("List with three values, using a local key:")
        print(timeit("z = e[key]", "from __main__ import e, key"))

    Named tuple with a, b, c:
    0.147349834442
    Named tuple, using index:
    0.0364408493042
    Class using __slots__, with a, b, c:
    0.0334758758545
    Dictionary with keys a, b, c:
    0.0339260101318
    Tuple with three values, using a constant key:
    0.0425179004669
    List with three values, using a constant key:
    0.0301761627197
    Tuple with three values, using a local key:
    0.0436310768127
    List with three values, using a local key:
    0.0309669971466