Improve readability of extra stripping and fix typo

Co-authored-by: chrysle <fritzihab@posteo.de>

piptools/utils.py

@@ -83,8 +83,7 @@ def key_no_extra_from_req(
 ) -> str:
     """Get an all-lowercase version of the requirement's name without any extras."""
     name = req.name
-    extra_start_index = name.find("[")
-    package_name = name if extra_start_index == -1 else name[:extra_start_index]
+    package_name = name.split("[", 1)[0]
     return str(canonicalize_name(package_name))
 
 

tests/test_resolver.py

@@ -651,7 +651,7 @@ def wrap_resolution_impossible(*args, **kwargs):
     # resolver has been rigged to raise a DistributionNotFound exception with
     # a cause that refers to the entries of conflicting_ireqs.
     # We expect _do_resolve() to handle this exception by dropping
-    # the these entries from existing_constraints and returning False.
+    # these entries from existing_constraints and returning False.
     # It should _not_ drop any compatible constraint or re-raise
     # the DistributionNotFound exception.
     result = bt_resolver._do_resolve(resolver, existing_constraints)