human
Complete this python program:
def expose(func=None, alias=None):
assistant
#Here is the Python program you requested.

    """Expose the function, optionally providing an alias or set of aliases.
    """
    def expose_(func):
        func.exposed = True
        if (alias is not None):
            if isinstance(alias, basestring):
                parents[alias.replace('.', '_')] = func
            else:
                for a in alias:
                    parents[a.replace('.', '_')] = func
        return func
    import sys
    import types
    if isinstance(func, (types.FunctionType, types.MethodType)):
        if (alias is None):
            func.exposed = True
            return func
        else:
            parents = sys._getframe(1).f_locals
            return expose_(func)
    elif (func is None):
        if (alias is None):
            parents = sys._getframe(1).f_locals
            return expose_
        else:
            parents = sys._getframe(1).f_locals
            return expose_
    else:
        parents = sys._getframe(1).f_locals
        alias = func
        return expose_