# IsEven 类
<a name="aws-glue-api-pyspark-transforms-IsEven"></a>

 `IsEven` 转换会在新列中返回布尔值，用于指示源列或值是否为偶数。如果源列或值为十进制，则结果为 false。

## 示例
<a name="pyspark-IsEven-examples"></a>

```
from pyspark.context import SparkContext
from pyspark.sql import SparkSession
from awsgluedi.transforms import *

sc = SparkContext()
spark = SparkSession(sc)

input_df = spark.createDataFrame(
    [(5,), (0,), (-1,), (2,), (None,)],
    ["source_column"],
)

try:
    df_output = math_functions.IsEven.apply(
        data_frame=input_df,
        spark_context=sc,
        source_column="source_column",
        target_column="target_column",
        value=None,
        true_string="Even",
        false_string="Not even",
    )
    df_output.show()
except:
    print("Unexpected Error happened ")
    raise
```

## Output
<a name="pyspark-IsEven-output"></a>

 输出是：

```
```
+------------+------------+
|source_column|target_column|
+------------+------------+
| 5| Not even|
| 0| Even|
| -1| Not even|
| 2| Even|
| null| null|
+------------+------------+
```
```

 `IsEven` 转换会将“source\_column”设为“source\_column”，将“target\_column”设为“target\_column”。它会检查“source\_column”中的值是否为偶数。如果该值为偶数，则会将“target\_column”的值设置为“true\_string”、“Even”。如果该值为奇数，则会将“target\_column”的值设置为“false\_string”、“Not even”。如果“source\_column”的值为“null”，则“target\_column”的值将设置为“null”。

 该转换可以正确识别偶数（0 和 2），并将“target\_column”的值设置为“Even”。对于奇数（5 和 -1），它会将“target\_column”的值设置为“Not even”。对于“source\_column”中的“null”值，“target\_column”的值会设置为“null”。

## 方法
<a name="aws-glue-api-pyspark-transforms-IsEven-_methods"></a>
+ [\_\_call\_\_](#aws-glue-api-pyspark-transforms-IsEven-__call__)
+ [apply](#aws-glue-api-crawler-pyspark-transforms-IsEven-apply)
+ [name](#aws-glue-api-crawler-pyspark-transforms-IsEven-name)
+ [describeArgs](#aws-glue-api-crawler-pyspark-transforms-IsEven-describeArgs)
+ [describeReturn](#aws-glue-api-crawler-pyspark-transforms-IsEven-describeReturn)
+ [describeTransform](#aws-glue-api-crawler-pyspark-transforms-IsEven-describeTransform)
+ [describeErrors](#aws-glue-api-crawler-pyspark-transforms-IsEven-describeErrors)
+ [describe](#aws-glue-api-crawler-pyspark-transforms-IsEven-describe)

## \_\_call\_\_(spark\_context, data\_frame, target\_column, source\_column=None, true\_string=DEFAULT\_TRUE\_STRING, false\_string=DEFAULT\_FALSE\_STRING, value=None)
<a name="aws-glue-api-pyspark-transforms-IsEven-__call__"></a>

 `IsEven` 转换会在新列中返回布尔值，用于指示源列或值是否为偶数。如果源列或值为十进制，则结果为 false。
+ `source_column`：现有列的名称。
+ `target_column` – 要创建的新列的名称。
+ `true_string`：指示值是否为偶数的字符串。
+ `false_string` – 表示该值是否不为偶数的字符串。

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

继承自 `GlueTransform` [apply](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-IsEven-name"></a>

继承自 `GlueTransform` [名称](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-IsEven-describeArgs"></a>

继承自 `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-IsEven-describeReturn"></a>

继承自 `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-IsEven-describeTransform"></a>

继承自 `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-IsEven-describeErrors"></a>

继承自 `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-IsEven-describe"></a>

继承自 `GlueTransform` [describe](aws-glue-api-crawler-pyspark-transforms-GlueTransform.md#aws-glue-api-crawler-pyspark-transforms-GlueTransform-describe)。