various python neatness cleanups

All changes were created by running

"pyupgrade --py3-only --keep-percent-format"

and committing the results. I have not touched string formatting for
now.

- use set literals
- simplify .format() parameter naming
- remove __future__
- remove default "r" mode for open()
- use OSError rather than compatibility aliases
- remove stray parentheses in function(generator) scopes

1 files changed, 1 insertions, 1 deletions

diff --git a/tools/regenerate_docs.py b/tools/regenerate_docs.py
index b9b994a1a..276583647 100755
--- a/tools/regenerate_docs.py
+++ b/tools/regenerate_docs.py
@@ -94,7 +94,7 @@ def get_commands_data(root_dir: Path) -> T.Dict[str, T.Any]:
         return out
 
     output = _get_meson_output(root_dir, ['--help'])
-    commands = set(c.strip() for c in re.findall(r'usage:(?:.+)?{((?:[a-z]+,*)+?)}', output, re.MULTILINE|re.DOTALL)[0].split(','))
+    commands = {c.strip() for c in re.findall(r'usage:(?:.+)?{((?:[a-z]+,*)+?)}', output, re.MULTILINE|re.DOTALL)[0].split(',')}
     commands.remove('help')
 
     cmd_data = dict()