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

2 files changed, 2 insertions, 2 deletions

diff --git a/tools/dircondenser.py b/tools/dircondenser.py
index 8da0ce2..b49d80f 100755
--- a/tools/dircondenser.py
+++ b/tools/dircondenser.py
@@ -54,7 +54,7 @@ def get_entries() -> T.List[T.Tuple[int, str]]:
     return entries
 
 def replace_source(sourcefile: str, replacements: T.List[T.Tuple[str, str]]) -> None:
-    with open(sourcefile, 'r') as f:
+    with open(sourcefile) as f:
         contents = f.read()
     for old_name, new_name in replacements:
         contents = contents.replace(old_name, new_name)
diff --git a/tools/regenerate_docs.py b/tools/regenerate_docs.py
index b9b994a..2765836 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()