Add rstrip in def _strip_extras

Author: mtsokol

news/13523.bugfix.rst

@@ -0,0 +1 @@
+Fix command parsing for ``pip install <path_to_whl_file> [<extras>]`` with whitespace between file path and extras section.

src/pip/_internal/req/constructors.py

@@ -47,7 +47,7 @@ def _strip_extras(path: str) -> tuple[str, str | None]:
     m = re.match(r"^(.+)(\[[^\]]+\])$", path)
     extras = None
     if m:
-        path_no_extras = m.group(1)
+        path_no_extras = m.group(1).rstrip()
         extras = m.group(2)
     else:
         path_no_extras = path

tests/unit/test_req.py

@@ -768,6 +768,7 @@ def test_requirement_file(self) -> None:
             ("pkg [ext] == 1.0; python_version<='3.6'", "pkg==1.0"),
             ("pkg-all.allowed_chars0 ~= 2.0", "pkg-all.allowed_chars0~=2.0"),
             ("pkg-all.allowed_chars0 [ext] ~= 2.0", "pkg-all.allowed_chars0~=2.0"),
+            ("simple-0.1-py2.py3-none-any.whl [ext]", "simple==0.1"),
         ],
     )
     def test_install_req_drop_extras(self, inp: str, out: str) -> None: