# Editing or uploading a job script


Use the AWS Glue Studio visual editor to edit the job script or upload your own script.

You can use the visual editor to edit job nodes only if the jobs were created with AWS Glue Studio. If the job was created using the AWS Glue console, through API commands, or with the command line interface (CLI), you can use the script editor in AWS Glue Studio to edit the job script, parameters, and schedule. You can also edit the script for a job created in AWS Glue Studio by converting the job to script-only mode.

**To edit the job script or upload your own script**

1. If creating a new job, on the **Jobs** page, choose the **Spark script editor** option to create a Spark job or choose the **Python Shell script editor** to create a Python shell job. You can either write a new script, or upload an existing script. If you choose **Spark script editor**, you can write or upload either a Scala or Python script. If you choose **Python Shell script editor**, you can only write or upload a Python script.

   After choosing the option to create a new job, in the **Options** section that appears, you can choose to either start with a starter script (**Create a new script with boilerplate code**), or you can upload a local file to use as the job script.

   If you chose **Spark script editor**, you can upload either Python or Scala script files. Scala scripts must have the file extension `.scala`. Python scripts must be recognized as files of type Python. If you chose **Python Shell script editor**, you can upload only Python script files.

   When you are finished making your choices, choose **Create** to create the job and open the visual editor.

1. Go to the visual job editor for the new or saved job, and then choose the **Script** tab.

1. If you didn't create a new job using one of the script editor options, and you have never edited the script for an existing job, the **Script** tab displays the heading **Script (Locked)**. This means the script editor is in read-only mode. Choose **Edit script** to unlock the script for editing.

   To make the script editable, AWS Glue Studio converts your job from a visual job to a script-only job. If you unlock the script for editing, you can't use the visual editor anymore for this job after you save it.

   In the confirmation window, choose **Confirm** to continue or **Cancel** to keep the job available for visual editing.

   If you choose **Confirm**, the **Visual** tab no longer appears in the editor. You can use AWS Glue Studio to modify the script using the script editor, modify the job details or schedule, or view job runs.
**Note**  
Until you save the job, the conversion to a script-only job is not permanent. If you refresh the console web page, or close the job before saving it and reopen it in the visual editor, you will still be able to edit the individual nodes in the visual editor.

1. Edit the script as needed. 

   When you are done editing the script, choose **Save** to save the job and permanently convert the job from visual to script-only.

1. (Optional) You can download the script from the AWS Glue Studio console by choosing the **Download** button on the **Script** tab. When you choose this button, a new browser window opens, displaying the script from its location in Amazon S3. The **Script filename** and **Script path** parameters in the **Job details** tab of the job determine the name and location of the script file in Amazon S3.   
![\[\]](http://docs.aws.amazon.com/glue/latest/dg/images/job-details-script-location-params-screenshot.png)

   When you save the job, AWS Glue save the job script at the location specified by these fields. If you modify the script file at this location within Amazon S3, AWS Glue Studio will load the modified script the next time you edit the job.

## Creating and editing Scala scripts in AWS Glue Studio


When you choose the script editor for creating a job, by default, the job programming language is set to `Python 3`. If you choose to write a new script instead of uploading a script, AWS Glue Studio starts a new script with boilerplate text written in Python. If you want to write a Scala script instead, you must first configure the script editor to use Scala.

**Note**  
If you choose Scala as the programming language for the job and use the visual editor to design your job, the generated job script is written in Scala, and no further actions are needed.

**To write a new Scala script in AWS Glue Studio**

1. Create a new job by choosing the **Spark script editor** option.

1. Under **Options**, choose **Create a new script with boilerplate code**.

1. Choose the **Job details** tab and set **Language** to `Scala` (instead of `Python 3`).
**Note**  
The **Type** property for the job is automatically set to `Spark` when you choose the **Spark script editor** option to create a job. 

1. Choose the **Script** tab.

1. Remove the Python boilerplate text. You can replace it with the following Scala boilerplate text.

   ```
   import com.amazonaws.services.glue.{DynamicRecord, GlueContext}
   import org.apache.spark.SparkContext
   import com.amazonaws.services.glue.util.JsonOptions
   import com.amazonaws.services.glue.util.GlueArgParser
   import com.amazonaws.services.glue.util.Job
   
   object MyScript {
     def main(args: Array[String]): Unit = {
       val sc: SparkContext = new SparkContext()
       val glueContext: GlueContext = new GlueContext(sc)
   
       }
   }
   ```

1. Write your Scala job script in the editor. Add additional `import` statements as needed.

## Creating and editing Python shell jobs in AWS Glue Studio


When you choose the Python shell script editor for creating a job, you can upload an existing Python script, or write a new one. If you choose to write a new script, boilerplate code is added to the new Python job script. 

**To create a new Python shell job**  
Refer to the instructions at [Starting jobs in AWS Glue Studio](edit-nodes-chapter.md#create-jobs-start).

The job properties that are supported for Python shell jobs are not the same as those supported for Spark jobs. The following list describes the changes to the available job parameters for Python shell jobs on the **Job details** tab.
+ The **Type** property for the job is automatically set to `Python Shell` and can't be changed. 
+ Instead of **Language**, there is a **Python version** property for the job. Currently, Python shell jobs created in AWS Glue Studio use Python 3.6.
+ The **Glue version** property is not available, because it does not apply to Python shell jobs.
+ Instead of **Worker type** and **Number of workers**, a **Data processing units** property is shown instead. This job property determines how many data processing units (DPUs) are consumed by the Python shell when running the job.
+ The **Job bookmark** property is not available, because it is not supported for Python shell jobs.
+ Under **Advanced properties**, the following properties are not available for Python shell jobs.
  + **Job metrics**
  + **Continuous logging**
  + **Spark UI** and **Spark UI logs path**
  + **Dependent jars path**, under the heading **Libraries**