.. py:function:: create_unary(op, tree, modifiers = None)

   
   Return the expression tree for a unary operator.


   :Parameters:

       **op** : :class:`python:str`
           Unary operator to call: - | + | !

       **tree** : :obj:`EX`
           Operand: expression tree.

       **modifiers** : :obj:`Union`\[:obj:`ET`, :obj:`LIST`\[:obj:`ET`]], default: :data:`python:None`
           List of higher-order constructs.

   :Returns:

       :obj:`ET`
           ..













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