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if foo=="bar":
    do_something()

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from sqlalchemy import or_
filter(or_(User.name == 'ed', User.name == 'wendy'))

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class ColumComparer(object):


    def __init__(self, name):
        self.name = name
        self.other_expression = None

        

    def __eq__(self, other):
        self.other_expression = other
        return self
    

    def __str__(self):
        assert self.other_expression is not None
        return "%s == %r" % (self.name, self.other_expression)


cc = ColumComparer("foo")

print cc == "bar"