Python

This component is used for executing Python Script. The Python Script to be executed is specified using the Custom Property Sheet (CPS). This component executes the script on documents it receives as input and returns the result.

The component uses the document object to get the content and properties of the message. The result after executing the script should be set back onto the document object.

Points to note

Input message content and properties can be accessed using document object.For example, 'document.getText()' returns input message content.To access a message property named 'TestProperty, 'document.getRecord().getProperty('TestProperty')' returns the value of the property.
Message properties can be set using 'setProperty' method.
Message properties which are set on input message also appear on output message unless they are changed in the script.For example, if a property named 'TestProperty' is present on input message then output message also contains the property unless it is changed in the script provided.
Output message content can be set either by using 'setText(String value)' of document object or by specifying a return value(using 'print') in the script provided. If both are present, the return value is set as message content.

Configuration and Testing

Interaction Configuration

Figure 1: Interaction Configurations panel in Python CPS

Attributes

Read Script from file?

If enabled, Script file path property appears where you can provide the location where the script file is saved.

Script File Path

Provide the complete path of the Python Script file (file should have .py extension) which you want to execute.

Figure 2: Script file path property to provide the location where the script file is saved

PythonScript

If the Read Script from file ? property is disabled, populate the PythonScript property with the Python Script.

For the Expert Properties such as Cleanup resources (excluding connection) after each document and Target Namespace, Elements to Decrypt and Elements to encrypt, refer respective sections in Common Configurations page.
For the Monitoring configuration property too, refer the respective section in the above-mentioned page.

Replace Control Characters

If this property is enabled, Control Characters present in the input will be replaced by a string representation of the same value during script evaluation. This is an expert property.

Scheduler Configuration

Please refer the respective section in Common Configurations page.

Transport Configurations

Please refer the respective section in Common Configurations page.

Transport Configurations panel will be available only if scheduling is enabled in Scheduler Configurations panel.

Error Handling

Please refer the sections Request Processing Error and Invalid Request Error in the Error Handling section of Common Configurations page for details.

Sample Input and Output

The configuration can be tested by clicking the Test button in the interaction Configuration panel.

Below is a sample Python script.

PY

width = 20;
height = 5*9;
print width * height;

Figure 3: Sample Python Script

Below are the sample input and the output respectively for the above script.

Figure 4: Sample Input Message

Figure 5: Response Generated

Functional Demonstration

Scenario 1

Execution of Python Script provided.

Configure the Python Script adapter as described in Configuration and Testing section and use feeder and display component to send sample input and to check the response respectively.

Figure 6: Scenario demonstration with sample input and output

Scenario 2

This sample demonstrates accessing an input message.

Configure the component with the following script.

PY

print (document.getText());

Figure 7: Sample Python Script

Figure 8: Sample Input Message

Figure 9: Response Generated