# SelectFromCollection class SelectFromCollection Selects one `DynamicFrame` in a `DynamicFrameCollection`. ## Example Example This example uses `SelectFromCollection` to select a `DynamicFrame` from a `DynamicFrameCollection`. **Example dataset** The example selects two `DynamicFrames` from a `DynamicFrameCollection` called `split_rows_collection`. The following is the list of keys in `split_rows_collection`. ``` dict_keys(['high', 'low']) ``` **Example code** ``` # Example: Use SelectFromCollection to select # DynamicFrames from a DynamicFrameCollection from pyspark.context import SparkContext from awsglue.context import GlueContext from awsglue.transforms import SelectFromCollection # Create GlueContext sc = SparkContext.getOrCreate() glueContext = GlueContext(sc) # Select frames and inspect entries frame_low = SelectFromCollection.apply(dfc=split_rows_collection, key="low") frame_low.toDF().show() frame_high = SelectFromCollection.apply(dfc=split_rows_collection, key="high") frame_high.toDF().show() ``` ### Output ``` +---+-----+------------------------+-------------------------+ | id|index|contact_details.val.type|contact_details.val.value| +---+-----+------------------------+-------------------------+ | 1| 0| fax| 202-225-3307| | 1| 1| phone| 202-225-5731| | 2| 0| fax| 202-225-3307| | 2| 1| phone| 202-225-5731| | 3| 0| fax| 202-225-3307| | 3| 1| phone| 202-225-5731| | 4| 0| fax| 202-225-3307| | 4| 1| phone| 202-225-5731| | 5| 0| fax| 202-225-3307| | 5| 1| phone| 202-225-5731| | 6| 0| fax| 202-225-3307| | 6| 1| phone| 202-225-5731| | 7| 0| fax| 202-225-3307| | 7| 1| phone| 202-225-5731| | 8| 0| fax| 202-225-3307| | 8| 1| phone| 202-225-5731| | 9| 0| fax| 202-225-3307| | 9| 1| phone| 202-225-5731| | 10| 0| fax| 202-225-6328| | 10| 1| phone| 202-225-4576| +---+-----+------------------------+-------------------------+ only showing top 20 rows +---+-----+------------------------+-------------------------+ | id|index|contact_details.val.type|contact_details.val.value| +---+-----+------------------------+-------------------------+ | 11| 0| fax| 202-225-6328| | 11| 1| phone| 202-225-4576| | 11| 2| twitter| RepTrentFranks| | 12| 0| fax| 202-225-6328| | 12| 1| phone| 202-225-4576| | 12| 2| twitter| RepTrentFranks| | 13| 0| fax| 202-225-6328| | 13| 1| phone| 202-225-4576| | 13| 2| twitter| RepTrentFranks| | 14| 0| fax| 202-225-6328| | 14| 1| phone| 202-225-4576| | 14| 2| twitter| RepTrentFranks| | 15| 0| fax| 202-225-6328| | 15| 1| phone| 202-225-4576| | 15| 2| twitter| RepTrentFranks| | 16| 0| fax| 202-225-6328| | 16| 1| phone| 202-225-4576| | 16| 2| twitter| RepTrentFranks| | 17| 0| fax| 202-225-6328| | 17| 1| phone| 202-225-4576| +---+-----+------------------------+-------------------------+ only showing top 20 rows ``` ## Methods  — methods — + [\$1\$1call\$1\$1](#aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-__call__) + [apply](#aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-apply) + [name](#aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-name) + [describeArgs](#aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-describeArgs) + [describeReturn](#aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-describeReturn) + [describeTransform](#aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-describeTransform) + [describeErrors](#aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-describeErrors) + [describe](#aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-describe) ## \$1\$1call\$1\$1(dfc, key, transformation\$1ctx = "") \$1\$1call\$1\$1 Gets one `DynamicFrame` from a `DynamicFrameCollection`. + `dfc` – The `DynamicFrameCollection` that the `DynamicFrame` should be selected from (required). + `key` – The key of the `DynamicFrame` to select (required). + `transformation_ctx` – A unique string that is used to identify state information (optional). ## apply(cls, \$1args, \$1\$1kwargs) apply Inherited from `GlueTransform` [apply](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-apply). ## name(cls) name Inherited from `GlueTransform` [name](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-name). ## describeArgs(cls) describeArgs Inherited from `GlueTransform` [describeArgs](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describeArgs). ## describeReturn(cls) describeReturn Inherited from `GlueTransform` [describeReturn](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describeReturn). ## describeTransform(cls) describeTransform Inherited from `GlueTransform` [describeTransform](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describeTransform). ## describeErrors(cls) describeErrors Inherited from `GlueTransform` [describeErrors](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describeErrors). ## describe(cls) describe Inherited from `GlueTransform` [describe](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describe).