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How to use _replace_if_needed method in tox

Best Python code snippet using tox_python

pipeline.py

Source:pipeline.py

...146    class TransformUpdater(PipelineVisitor): # pylint: disable=used-before-assignment147      """"A visitor that replaces the matching PTransforms."""148      def __init__(self, pipeline):149        self.pipeline = pipeline150      def _replace_if_needed(self, transform_node):151        if matcher(transform_node):152          replacement_transform = override.get_replacement_transform(153              transform_node.transform)154          inputs = transform_node.inputs155          # TODO:  Support replacing PTransforms with multiple inputs.156          if len(inputs) > 1:157            raise NotImplementedError(158                'PTransform overriding is only supported for PTransforms that '159                'have a single input. Tried to replace input of '160                'AppliedPTransform %r that has %d inputs',161                transform_node, len(inputs))162          transform_node.transform = replacement_transform163          self.pipeline.transforms_stack.append(transform_node)164          # Keeping the same label for the replaced node but recursively165          # removing labels of child transforms since they will be replaced166          # during the expand below.167          self.pipeline._remove_labels_recursively(transform_node)168          new_output = replacement_transform.expand(inputs[0])169          if new_output.producer is None:170            # When current transform is a primitive, we set the producer here.171            new_output.producer = transform_node172          # We only support replacing transforms with a single output with173          # another transform that produces a single output.174          # TODO: Support replacing PTransforms with multiple outputs.175          if (len(transform_node.outputs) > 1 or176              not isinstance(transform_node.outputs[None], PCollection) or177              not isinstance(new_output, PCollection)):178            raise NotImplementedError(179                'PTransform overriding is only supported for PTransforms that '180                'have a single output. Tried to replace output of '181                'AppliedPTransform %r with %r.'182                , transform_node, new_output)183          # Recording updated outputs. This cannot be done in the same visitor184          # since if we dynamically update output type here, we'll run into185          # errors when visiting child nodes.186          output_map[transform_node.outputs[None]] = new_output187          self.pipeline.transforms_stack.pop()188      def enter_composite_transform(self, transform_node):189        self._replace_if_needed(transform_node)190      def visit_transform(self, transform_node):191        self._replace_if_needed(transform_node)192    self.visit(TransformUpdater(self))193    # Adjusting inputs and outputs194    class InputOutputUpdater(PipelineVisitor): # pylint: disable=used-before-assignment195      """"A visitor that records input and output values to be replaced.196      Input and output values that should be updated are recorded in maps197      input_replacements and output_replacements respectively.198      We cannot update input and output values while visiting since that results199      in validation errors.200      """201      def __init__(self, pipeline):202        self.pipeline = pipeline203      def enter_composite_transform(self, transform_node):204        self.visit_transform(transform_node)205      def visit_transform(self, transform_node):...

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