[clang-tidy] Change shebang from python to python3

[hokein]

Summary

want some opinions on this.

see thread: https://lists.llvm.org/pipermail/cfe-dev/2021-April/068047.html

[keith]

I also have this patch https://reviews.llvm.org/D100692 which changes run-clang-tidy.py this way as well, specifically because it utilizes some python3 features in shutil.which

[tdl-g]

I'll defer to the consensus on https://lists.llvm.org/pipermail/cfe-dev/2021-April/068047.html regarding whether or not there are gotchas for requiring python3,, but assuming tests have confirmed that each of these scripts are python3 compatible, this seems reasonable to me.

[keith]

Doesn't seem like anything changed on the mailing list side, should we land this now?

[keith]

@hokein any plans to land this?

[kastiglione]

+1 to committing this.

[xgupta]

https://reviews.llvm.org/rG475440703238ca32adab6c3fe5e0039c3f96d1a5 committed the remaining shebang change from python to python3.

clang-tools-extra/clang-tidy/add_new_check.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 #===- add_new_check.py - clang-tidy check generator ---------*- python -*--===#
 #
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===-----------------------------------------------------------------------===#

clang-tools-extra/clang-tidy/rename_check.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 #===- rename_check.py - clang-tidy check renamer ------------*- python -*--===#
 #
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===-----------------------------------------------------------------------===#

clang-tools-extra/clang-tidy/tool/clang-tidy-diff.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 #===- clang-tidy-diff.py - ClangTidy Diff Checker -----------*- python -*--===#
 #
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===-----------------------------------------------------------------------===#

clang-tools-extra/clang-tidy/tool/run-clang-tidy.py

-#!/usr/bin/env python
+#!/usr/bin/env python3
 #
 #===- run-clang-tidy.py - Parallel clang-tidy runner --------*- python -*--===#
 #
 # Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 # See https://llvm.org/LICENSE.txt for license information.
 # SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 #
 #===-----------------------------------------------------------------------===#