Install pyright from PyPI (#11575)

tests/pyright_test.py

@@ -6,7 +6,7 @@ import subprocess
 import sys
 from pathlib import Path
 
-import tomli
+from utils import parse_requirements, print_command
 
 _WELL_KNOWN_FILE = Path("tests", "pyright_test.py")
 
@@ -29,12 +29,16 @@ def main() -> None:
         print("error running npx; is Node.js installed?", file=sys.stderr)
         sys.exit(1)
 
-    with open("pyproject.toml", "rb") as config:
-        pyright_version: str = tomli.load(config)["tool"]["typeshed"]["pyright_version"]
+    req = parse_requirements()["pyright"]
+    spec = str(req.specifier)
+    pyright_version = spec[2:]
 
+    # TODO: We're currently using npx to run pyright, instead of calling the
+    # version installed into the virtual environment, due to failures on some
+    # platforms. https://github.com/python/typeshed/issues/11614
     os.environ["PYRIGHT_PYTHON_FORCE_VERSION"] = pyright_version
     command = [npx, f"pyright@{pyright_version}"] + sys.argv[1:]
-    print("Running:", " ".join(command))
+    print_command(command)
 
     ret = subprocess.run(command).returncode
     sys.exit(ret)