# SelectFromCollection クラス
<a name="aws-glue-api-crawler-pyspark-transforms-SelectFromCollection"></a>

`DynamicFrameCollection` で `DynamicFrame` を 1 つ選択します。

## 例
<a name="pyspark-SelectFromCollection-example"></a>

この例では、`SelectFromCollection` を使用して、`DynamicFrame` を `DynamicFrameCollection` から選択します。

**データセットの例**

この例では、`split_rows_collection` と呼ばれる `DynamicFrameCollection` から 2 つの `DynamicFrames` を選択します。次のリストに示しているのは、`split_rows_collection` のキーです。

```
dict_keys(['high', 'low'])
```

**コードの例**

```
# 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
<a name="SelectFromCollection-example-output"></a>

```
+---+-----+------------------------+-------------------------+
| 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
```

## 方法
<a name="aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-_methods"></a>
+ [\$1\$1call\$1\$1](#aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-__call__)
+ [適用](#aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-apply)
+ [名前](#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)
+ [説明](#aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-describe)

## \$1\$1call\$1\$1(dfc, key, transformation\$1ctx = "")
<a name="aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-__call__"></a>

`DynamicFrameCollection` から `DynamicFrame` を 1 つ取得します。
+ `dfc` – 選択すべき `DynamicFrame` を含む `DynamicFrameCollection` (必須)。
+ `key` – 選択する `DynamicFrame` のキー (必須)。
+ `transformation_ctx` - 状態情報を識別するために使用される一意の文字列 (オプション)。

## apply(cls, \$1args, \$1\$1kwargs)
<a name="aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-apply"></a>

継承元は `GlueTransform` [適用](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-apply)。

## name(cls)
<a name="aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-name"></a>

継承元は `GlueTransform` [名前](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-name)。

## describeArgs(cls)
<a name="aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-describeArgs"></a>

継承元は `GlueTransform` [describeArgs](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describeArgs)。

## describeReturn(cls)
<a name="aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-describeReturn"></a>

継承元は `GlueTransform` [describeReturn](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describeReturn)。

## describeTransform(cls)
<a name="aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-describeTransform"></a>

継承元は `GlueTransform` [describeTransform](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describeTransform)。

## describeErrors(cls)
<a name="aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-describeErrors"></a>

継承元は `GlueTransform` [describeErrors](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describeErrors)。

## describe(cls)
<a name="aws-glue-api-crawler-pyspark-transforms-SelectFromCollection-describe"></a>

継承元は `GlueTransform` [説明](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describe)。