Class UserList

Lib/collections/__init__.py:1268–1394

A more or less complete user-defined wrapper around list objects.

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class UserList(_collections_abc.MutableSequence):
    """A more or less complete user-defined wrapper around list objects."""

    def __init__(self, initlist=None):
        self.data = []
        if initlist is not None:
            # XXX should this accept an arbitrary sequence?
            if type(initlist) == type(self.data):
                self.data[:] = initlist
            elif isinstance(initlist, UserList):
                self.data[:] = initlist.data[:]
            else:
                self.data = list(initlist)

    def __repr__(self):
        return repr(self.data)

    def __lt__(self, other):
        return self.data < self.__cast(other)

    def __le__(self, other):
        return self.data <= self.__cast(other)

    def __eq__(self, other):
        return self.data == self.__cast(other)

    def __gt__(self, other):
        return self.data > self.__cast(other)

    def __ge__(self, other):
        return self.data >= self.__cast(other)

    def __cast(self, other):
        return other.data if isinstance(other, UserList) else other

    def __contains__(self, item):
        return item in self.data

    def __len__(self):
        return len(self.data)

    def __getitem__(self, i):
        if isinstance(i, slice):
            return self.__class__(self.data[i])
        else:
            return self.data[i]

    def __setitem__(self, i, item):
        self.data[i] = item

    def __delitem__(self, i):
        del self.data[i]

    def __add__(self, other):
        if isinstance(other, UserList):
            return self.__class__(self.data + other.data)
        elif isinstance(other, type(self.data)):
            return self.__class__(self.data + other)