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        Matthias Bussonnier
    
add WN

              r25918
            
      Input transformers are now called only once in the execution path of `InteractiveShell`, allowing to register

      transformer that potentially have side effects (note that this is not recommended). `should_run_async`, and

      `run_cell_async` now take a recommended optional `transformed_cell`, and `preprocessing_exc_tuple` parameters that will

      become mandatory at some point in the future; that is to say cells need to be explicitly transformed to be valid Python

      syntax ahead of trying to run them. :ghpull:`12440`

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Matthias Bussonnier add WN	r25918	Input transformers are now called only once in the execution path of `InteractiveShell`, allowing to register
		transformer that potentially have side effects (note that this is not recommended). `should_run_async`, and
		`run_cell_async` now take a recommended optional `transformed_cell`, and `preprocessing_exc_tuple` parameters that will
		become mandatory at some point in the future; that is to say cells need to be explicitly transformed to be valid Python
		syntax ahead of trying to run them. :ghpull:`12440`