GitHub pull request #3296 of commit 86a44edcb197ca7fc4f14dc36a516efb0ed64744, no merge conflicts.sha1origin/pr/3296/mergeghprbActualCommit86a44edcb197ca7fc4f14dc36a516efb0ed64744ghprbActualCommitAuthorghprbActualCommitAuthorEmailghprbAuthorRepoGitUrlhttps://github.com/jongiddy/bcc.gitghprbTriggerAuthorghprbTriggerAuthorEmailghprbTriggerAuthorLoginyonghong-songghprbTriggerAuthorLoginMention@yonghong-songghprbPullId3296ghprbTargetBranchmasterghprbSourceBranchadd-mypy-typesGIT_BRANCHadd-mypy-typesghprbPullAuthorEmailghprbPullAuthorLoginjongiddyghprbPullAuthorLoginMention@jongiddyghprbPullDescriptionGitHub pull request #3296 of commit 86a44edcb197ca7fc4f14dc36a516efb0ed64744, no merge conflicts.ghprbPullTitleAdd mypy type checkingghprbPullLinkhttps://github.com/iovisor/bcc/pull/3296ghprbPullLongDescriptionI've previously found issues with strings and bytes being mixed when running bcc tools using Python 3 (e.g. https://github.com/iovisor/bcc/pull/3277, https://github.com/iovisor/bcc/pull/3288). Rather than hit these randomly while using the tools, this PR adds mypy testing for the Python code.\r\n\r\nThis PR adds a GitHub Actions test that checks both Python 2 and Python 3 types. It adds code fixes and ignores to get the repo to pass both these checks. The type annotations are in comment form that is acceptable to both Python 2 and 3.\r\n\r\nI also added function type descriptions to the `ArgString` type, to ensure that the change from https://github.com/iovisor/bcc/pull/3288 didn't break anything unexpected. The intent is that more function type descriptions can be added over time to ensure that the code works well with both Python 2 and Python 3. But I want to check that this change is acceptable before adding more annotations.ghprbCommentBody[buildbot, test this please]ghprbGhRepositoryiovisor/bccghprbCredentialsId6d3daf13-69b8-48b1-9c8f-ec5353264113false<a title="Add mypy type checking" href="https://github.com/iovisor/bcc/pull/3296">PR #3296</a>: Add mypy type checking#87124148237460664bcc-pr #871871false8716977SUCCESS1615179251588https://buildbot.iovisor.org/jenkins/user/jmarchan/my-views/view/all/job/bcc-pr/871/git871https://buildbot.iovisor.org/jenkins/user/jmarchan/my-views/view/all/job/bcc-pr/label=fc25/871/871https://buildbot.iovisor.org/jenkins/user/jmarchan/my-views/view/all/job/bcc-pr/label=fc26/871/871https://buildbot.iovisor.org/jenkins/user/jmarchan/my-views/view/all/job/bcc-pr/label=fc27/871/871https://buildbot.iovisor.org/jenkins/user/jmarchan/my-views/view/all/job/bcc-pr/label=fc28/871/871https://buildbot.iovisor.org/jenkins/user/jmarchan/my-views/view/all/job/bcc-pr/label=ubuntu1604/871/871https://buildbot.iovisor.org/jenkins/user/jmarchan/my-views/view/all/job/bcc-pr/label=ubuntu1710/871/871https://buildbot.iovisor.org/jenkins/user/jmarchan/my-views/view/all/job/bcc-pr/label=ubuntu1804/871/