refactor: prefer f-strings to other format/concatentation styles (#8474)

scripts/create_baseline_stubs.py

@@ -59,7 +59,7 @@ def copy_stubs(src_base_dir: str, package: str, stub_dir: str) -> None:
     if os.path.isdir(src_dir):
         shutil.copytree(src_dir, os.path.join(stub_dir, package))
     else:
-        src_file = os.path.join("out", package + ".pyi")
+        src_file = os.path.join("out", f"{package}.pyi")
         if not os.path.isfile(src_file):
             sys.exit("Error: Cannot find generated stubs")
         shutil.copy(src_file, stub_dir)

scripts/stubsabot.py

@@ -148,7 +148,7 @@ async def package_contains_py_typed(release_to_download: dict[str, Any], session
 
 
 def _check_spec(updated_spec: str, version: packaging.version.Version) -> str:
-    assert version in packaging.specifiers.SpecifierSet("==" + updated_spec), f"{version} not in {updated_spec}"
+    assert version in packaging.specifiers.SpecifierSet(f"=={updated_spec}"), f"{version} not in {updated_spec}"
     return updated_spec
 
 
@@ -183,7 +183,7 @@ async def determine_action(stub_path: Path, session: aiohttp.ClientSession) -> U
         return NoUpdate(stub_info.distribution, "no longer updated")
 
     pypi_info = await fetch_pypi_info(stub_info.distribution, session)
-    spec = packaging.specifiers.SpecifierSet("==" + stub_info.version_spec)
+    spec = packaging.specifiers.SpecifierSet(f"=={stub_info.version_spec}")
     if pypi_info.version in spec:
         return NoUpdate(stub_info.distribution, "up to date")
 

tests/mypy_test.py

@@ -147,7 +147,7 @@ def parse_versions(fname: StrPath) -> dict[str, tuple[MinVersion, MaxVersion]]:
             if line == "":
                 continue
             m = _VERSION_LINE_RE.match(line)
-            assert m, "invalid VERSIONS line: " + line
+            assert m, f"invalid VERSIONS line: {line}"
             mod: str = m.group(1)
             min_version = parse_version(m.group(2))
             max_version = parse_version(m.group(3)) if m.group(3) else (99, 99)
@@ -160,7 +160,7 @@ _VERSION_RE = re.compile(r"^([23])\.(\d+)$")
 
 def parse_version(v_str: str) -> tuple[int, int]:
     m = _VERSION_RE.match(v_str)
-    assert m, "invalid version: " + v_str
+    assert m, f"invalid version: {v_str}"
     return int(m.group(1)), int(m.group(2))
 
 

tests/pyright_test.py

@@ -27,7 +27,7 @@ def main() -> None:
         print("error running npx; is Node.js installed?", file=sys.stderr)
         sys.exit(1)
 
-    command = [npx, "-p", "pyright@" + _PYRIGHT_VERSION, "pyright"] + sys.argv[1:]
+    command = [npx, "-p", f"pyright@{_PYRIGHT_VERSION}", "pyright"] + sys.argv[1:]
 
     ret = subprocess.run(command).returncode
     sys.exit(ret)

tests/stubtest_stdlib.py

@@ -46,7 +46,7 @@ def run_stubtest(typeshed_dir: Path) -> int:
             "\nNB: stubtest output depends on the Python version (and system) it is run with. "
             "See README.md for more details.\n"
             "NB: We only check positional-only arg accuracy for Python 3.10.\n"
-            "\nCommand run was: {}\n".format(" ".join(cmd)),
+            f"\nCommand run was: {' '.join(cmd)}\n",
             file=sys.stderr,
         )
         print("\n\n", file=sys.stderr)