Auto merge of #25239 - marmeladema:issue-23607/test-tidy-no-wpt, r=jdm

Make `mach test-tidy --no-wpt` compatible with Python3

Make `mach test-tidy --no-wpt` compatible with Python3
See also #23607

After this pull request, all python files (except WPT) will be checked for Python3 syntax compatibility.

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors

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- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because ___

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1 files changed, 1 insertions, 1 deletions

diff --git a/python/servo/command_base.py b/python/servo/command_base.py
index 764afc9a15a..86121b38fb0 100644
--- a/python/servo/command_base.py
+++ b/python/servo/command_base.py
@@ -627,7 +627,7 @@ install them, let us know by filing a bug!")
     def build_env(self, hosts_file_path=None, target=None, is_build=False, test_unit=False, uwp=False, features=None):
         """Return an extended environment dictionary."""
         env = os.environ.copy()
-        if sys.platform == "win32" and type(env['PATH']) == unicode:
+        if sys.platform == "win32" and type(env['PATH']) == six.text_type:
             # On win32, the virtualenv's activate_this.py script sometimes ends up
             # turning os.environ['PATH'] into a unicode string.  This doesn't work
             # for passing env vars in to a process, so we force it back to ascii.