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Editing File: /usr/lib64/python2.7/site-packages/lxml/html/_setmixin.py

class SetMixin(object):

"""
    Mix-in for sets.  You must define __iter__, add, remove
    """

def __len__(self):
        length = 0
        for item in self:
            length += 1
        return length

def __contains__(self, item):
        for has_item in self:
            if item == has_item:
                return True
        return False

def issubset(self, other):
        for item in other:
            if item not in self:
                return False
        return True

__le__ = issubset

def issuperset(self, other):
        for item in self:
            if item not in other:
                return False
        return True

__ge__ = issuperset

def union(self, other):
        return self | other

def __or__(self, other):
        new = self.copy()
        new |= other
        return new
    
    def intersection(self, other):
        return self & other

def __and__(self, other):
        new = self.copy()
        new &= other
        return new

def difference(self, other):
        return self - other

def __sub__(self, other):
        new = self.copy()
        new -= other
        return new

def symmetric_difference(self, other):
        return self ^ other

def __xor__(self, other):
        new = self.copy()
        new ^= other
        return new

def copy(self):
        return set(self)

def update(self, other):
        for item in other:
            self.add(item)

def __ior__(self, other):
        self.update(other)
        return self

def intersection_update(self, other):
        for item in self:
            if item not in other:
                self.remove(item)

def __iand__(self, other):
        self.intersection_update(other)
        return self

def difference_update(self, other):
        for item in other:
            if item in self:
                self.remove(item)

def __isub__(self, other):
        self.difference_update(other)
        return self

def symmetric_difference_update(self, other):
        for item in other:
            if item in self:
                self.remove(item)
            else:
                self.add(item)

def __ixor__(self, other):
        self.symmetric_difference_update(other)
        return self

def discard(self, item):
        try:
            self.remove(item)
        except KeyError:
            pass

def clear(self):
        for item in list(self):
            self.remove(item)

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