Python - challange "list without list"

#!/usr/bin/env python3

# Challaneg on Facebook in group Python Programming Language
# https://www.facebook.com/groups/python.programmers/permalink/2136776633006808/

class MyList:

    def __init__(self, data=None):
        raise NotImplementedError('You have to implement MyList.__init__()')

    def __str__(self):
        raise NotImplementedError('You have to implement MyList.__str__()')

    def __len__(self):
        raise NotImplementedError('You have to implement MyList.__len__()')

    def __getitem__(self, key):
        raise NotImplementedError('You have to implement MyList.__getitem__()')

    def __setitem__(self, key, value):
        raise NotImplementedError('You have to implement MyList.__setitem__()')

    def __in__(self, value):
        raise NotImplementedError('You have to implement MyList.__in__()')

    def __add__(self, value):
        raise NotImplementedError('You have to implement MyList.__add__()')

    def __radd__(self, value):
        raise NotImplementedError('You have to implement MyList.__radd__()')

    def __iter__(self):
        raise NotImplementedError('You have to implement MyList.__iter__()')

    def __next__(self):
        raise NotImplementedError('You have to implement MyList.__next__()')

    def append(self, data):
        raise NotImplementedError('You have to implement MyList.append()')

    def expand(self, data):
        raise NotImplementedError('You have to implement MyList.expand()')

    def contains(self, value):
        raise NotImplementedError('You have to implement MyList.contains()')

    def find(self, value):
        raise NotImplementedError('You have to implement MyList.find()')

# ----

#m = MyList()    # error: You have to implement MyList.__init__()
#print(m)        # error: You have to implement MyList.__str__()
#len(m)          # error: You have to implement MyList.__len__()
#m[0]            # error: You have to implement MyList.__getitem__()
#m[0:1]          # error: You have to implement MyList.__getitem__()
#m[0] = 1        # error: You have to implement MyList.__setitem__()
#m[0] = m[0] + 1 # error: You have to implement MyList.__getitem__() and MyList.__setitem__()
#for x in m:     # error: You have to implement MyList.__iter__() (and MyList.__next__())
#1 in m          # error: You have to implement MyList.__in__()
#m.append(1)     # error: You have to implement MyList.append()
#m.expand([1,2]) # error: You have to implement MyList.expand()
#m.contains(1)   # error: You have to implement MyList.contain()