Remove feature flags from Python package requirements

scone/default/recipes/python.py

@@ -14,7 +14,7 @@
 #
 #  You should have received a copy of the GNU General Public License
 #  along with Scone.  If not, see <https://www.gnu.org/licenses/>.
-
+import re
 from pathlib import Path
 from typing import List, Tuple
 
@@ -60,6 +60,7 @@ class PythonVenv(Recipe):
         preparation.needs("directory", str(Path(self.dir).parent))
 
         for name, flags in self.install:
+            featureless_name = re.sub(r"(\[[^]]+\])+$", "", name)
             if "-r" in flags:
                 preparation.needs("file", name)
             elif "git" in flags or "dir" in flags: