(dictionary, key, value)
If ``key`` is in ``dictionary``, set the new value of ``key``
        to be the union between the old value and ``value``.
        Otherwise, set the value of ``key`` to ``value.

        Returns ``True`` if the key already was in the dictionary and
        ``False`` otherwise.
If ``key`` is in ``dictionary``, set the new value of ``key``
        to be the union between the old value and ``value``.
        Otherwise, set the value of ``key`` to ``value.
If key is in dictionary set the new value of key to be the union between the old value and value . Otherwise set the value of key to value .
def _set_dict_union(dictionary, key, value):
        """
        If ``key`` is in ``dictionary``, set the new value of ``key``
        to be the union between the old value and ``value``.
        Otherwise, set the value of ``key`` to ``value.

        Returns ``True`` if the key already was in the dictionary and
        ``False`` otherwise.
        """
        if key in dictionary:
            dictionary[key] = dictionary[key] | value
            return True
        else:
            dictionary[key] = value
            return False
def _set_dict_union ( dictionary , key , value ) : if key in dictionary : dictionary [ key ] = dictionary [ key ] | value return True else : dictionary [ key ] = value return False