pipelines: add lint-py to liter pipeline

jenkins/pipelines/node-linter.jenkinsfile

@@ -22,7 +22,7 @@ pipeline {
                     userRemoteConfigs: [[
                         credentialsId: "96d5f81c-e9ad-45f7-ba5d-bc8107c0ae2c",
                         url: "[email protected]:${params.GITHUB_ORG}/${params.REPO_NAME}",
-                        refspec: "+refs/heads/*:refs/remotes/origin/* +${params.GIT_REMOTE_REF}:refs/remotes/origin/_jenkins_local_branch"
+                        refspec: "+${params.GIT_REMOTE_REF}:refs/remotes/origin/_jenkins_local_branch"
                     ]]
                 ])
             }
@@ -42,15 +42,22 @@ pipeline {
             steps {
                 // Calling with `returnStatus` suppresses automatic failures
                 sh(script: "${env.MAKE} lint-md-build", returnStatus: true)
+                sh(script: "${env.MAKE} lint-py-build", returnStatus: true)
             }
         }
 
         stage('Run tests') {
             steps {
                 script {
+                    def node_version = sh(script: "python  tools/getnodeversion.py", returnStdout: true).trim()
+                    def lint_py3_ret = 0
+                    if (node_version > '11') {
+                    // this job does not build node, so we use the system's node 
+                      lint_py3_ret = sh(script: "NODE=node PYTHON=python3 ${env.MAKE} lint-py", returnStatus: true)
+                    }
                     // this job does not build node, so we use the system's node 
                     def ret = sh(script: "NODE=node ${env.MAKE} lint-ci", returnStatus: true)
-                    if (ret != 0) {
+                    if (ret != 0 || lint_py3_ret != 0) {
                         echo(extractErrors())
                         error('lint failed - open above section for details')
                     }