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Formatter: Improve single-with item formatting for Python 3.8 or older (
#10276) ## Summary This PR changes how we format `with` statements with a single with item for Python 3.8 or older. This change is not compatible with Black. This is how we format a single-item with statement today ```python def run(data_path, model_uri): with pyspark.sql.SparkSession.builder.config( key="spark.python.worker.reuse", value=True ).config(key="spark.ui.enabled", value=False).master( "local-cluster[2, 1, 1024]" ).getOrCreate(): # ignore spark log output spark.sparkContext.setLogLevel("OFF") print(score_model(spark, data_path, model_uri)) ``` This is different than how we would format the same expression if it is inside any other clause header (`while`, `if`, ...): ```python def run(data_path, model_uri): while ( pyspark.sql.SparkSession.builder.config( key="spark.python.worker.reuse", value=True ) .config(key="spark.ui.enabled", value=False) .master("local-cluster[2, 1, 1024]") .getOrCreate() ): # ignore spark log output spark.sparkContext.setLogLevel("OFF") print(score_model(spark, data_path, model_uri)) ``` Which seems inconsistent to me. This PR changes the formatting of the single-item with Python 3.8 or older to match that of other clause headers. ```python def run(data_path, model_uri): with ( pyspark.sql.SparkSession.builder.config( key="spark.python.worker.reuse", value=True ) .config(key="spark.ui.enabled", value=False) .master("local-cluster[2, 1, 1024]") .getOrCreate() ): # ignore spark log output spark.sparkContext.setLogLevel("OFF") print(score_model(spark, data_path, model_uri)) ``` According to our versioning policy, this style change is gated behind a preview flag. ## Test Plan See added tests. Added
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