Integrate Python into CL and RPG on IBM i

python trainingPython has been gaining momentum for building utility applications on IBM i, such as creating/reading Excel files, data transfer, process automation, calling REST APIs such as Salesforce and ServiceNow, and application monitoring.

Although some have said that Python would become the “new CL,” one limitation remains. While Python can easily call CL, RPG, and COBOL programs, calls in the other direction—from CL, RPG or COBOL to Python—required extra effort.

In this post we will introduce you to the PYRUN command, from Richard Schoen’s open source PythonOniLibrary (, which makes it easy for traditional CL and RPG programs to call Python utilities and use their output. Read more