use python3 if available otherwise fallback to python

[smuzaffar]

test parameters:

• addpkg = FWCore

[cmsbuild]

A new Pull Request was created by @smuzaffar (Malik Shahzad Muzaffar) for branch master.

@cmsbuild, @smuzaffar, @iarspider can you please review it and eventually sign? Thanks. @perrotta, @dpiparo, @qliphy you are the release manager for this. cms-bot commands are listed here

[smuzaffar]

please test

[smuzaffar]

please test for rhel8_amd64_gcc10

[smuzaffar]

+externals this should fix the cmssw-patch release issue for rhel8 and cs9 ( where we do not deploy python)

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next master IBs after it passes the integration tests. This pull request will now be reviewed by the release team before it's merged. @perrotta, @dpiparo, @qliphy (and backports should be raised in the release meeting by the corresponding L2)

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-fce776/23378/summary.html COMMIT: 3457402f82b878f3b2ffc0191bfe14e0cc94eb85 CMSSW: CMSSW_12_4_X_2022-03-24-2300/slc7_amd64_gcc10 User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cms-git-tools/121/23378/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• No significant changes to the logs found
• Reco comparison results: 4 differences found in the comparisons
• DQMHistoTests: Total files compared: 49
• DQMHistoTests: Total histograms compared: 3695644
• DQMHistoTests: Total failures: 14
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3695608
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 3.096 KiB( 48 files compared)
• DQMHistoSizes: changed ( 11634.0,... ): 0.516 KiB HLT/Filters
• Checked 204 log files, 45 edm output root files, 49 DQM output files
• TriggerResults: no differences found

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-fce776/23379/summary.html COMMIT: 3457402f82b878f3b2ffc0191bfe14e0cc94eb85 CMSSW: CMSSW_12_4_X_2022-03-24-1100/rhel8_amd64_gcc10 User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cms-git-tools/121/23379/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• No significant changes to the logs found
• Reco comparison results: 66112 differences found in the comparisons
• DQMHistoTests: Total files compared: 49
• DQMHistoTests: Total histograms compared: 3695644
• DQMHistoTests: Total failures: 460993
• DQMHistoTests: Total nulls: 366
• DQMHistoTests: Total successes: 3234263
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 3.4070000000000005 KiB( 48 files compared)
• DQMHistoSizes: changed ( 10224.0 ): 0.063 KiB SiStrip/MechanicalView
• DQMHistoSizes: changed ( 11634.0,... ): 0.516 KiB HLT/Filters
• DQMHistoSizes: changed ( 11834.0 ): 2.372 KiB SiStrip/MechanicalView
• DQMHistoSizes: changed ( 250202.181 ): 0.006 KiB SiStrip/MechanicalView
• DQMHistoSizes: changed ( 25202.0 ): -0.117 KiB SiStrip/MechanicalView
• DQMHistoSizes: changed ( 312.0 ): -0.004 KiB MessageLogger/Warnings
• DQMHistoSizes: changed ( 7.3 ): -2.009 KiB SiStrip/MechanicalView
• Checked 204 log files, 45 edm output root files, 49 DQM output files