node {
stage('Preparation') { 
     properties([
         parameters([
             buildSelector(
             defaultSelector: lastSuccessful(),
             description: 'Which build to use for copying artifacts',
             name: 'BUILD_SELECTOR')
         ])
     ])
 }
 stage('checkout: Check out from version control') {
         checkout scm
 }
 stage('Copy Artifacts') {
     copyArtifacts fingerprintArtifacts: true, projectName: 's487182-create-dataset', selector: buildParameter('BUILD_SELECTOR')
     archiveArtifacts artifacts: 'waterQuality.csv, output.txt'
 }

 stage('sh: Shell Script') {
     sh 'python3 dataset_stats.py > output.txt'
     archiveArtifacts artifacts: 'output.txt'
 }
}