Improve fixes for ruff/flake8-simplify rule SIM103

docs/pip_sphinxext.py

@@ -37,11 +37,11 @@ def _is_version_section_title_underline(
         self, prev: Optional[str], curr: str
     ) -> bool:
         """Find a ==== line that marks the version section title."""
-        if prev is None:
-            return False
-        if re.match(r"^=+$", curr) is None:
-            return False
-        return not len(curr) < len(prev)
+        return (
+            prev is not None
+            and re.match(r"^=+$", curr) is not None
+            and len(curr) >= len(prev)
+        )
 
     def _iter_lines_with_refs(self, lines: Iterable[str]) -> Iterator[str]:
         """Transform the input lines to add a ref before each section title.

src/pip/_internal/req/constructors.py

@@ -261,11 +261,11 @@ def _looks_like_path(name: str) -> bool:
     * a path separator is found (either os.path.sep or os.path.altsep);
     * a dot is found (which represents the current directory).
     """
-    if os.path.sep in name:
-        return True
-    if os.path.altsep is not None and os.path.altsep in name:
-        return True
-    return name.startswith(".")
+    return (
+        os.path.sep in name
+        or (os.path.altsep is not None and os.path.altsep in name)
+        or name.startswith(".")
+    )
 
 
 def _get_url_from_path(path: str, name: str) -> Optional[str]:

src/pip/_internal/utils/misc.py

@@ -303,11 +303,10 @@ def is_installable_dir(path: str) -> bool:
     setup.cfg because using it without setup.py is only available for PEP 517
     projects, which are already covered by the pyproject.toml check.
     """
-    if not os.path.isdir(path):
-        return False
-    if os.path.isfile(os.path.join(path, "pyproject.toml")):
-        return True
-    return os.path.isfile(os.path.join(path, "setup.py"))
+    return os.path.isdir(path) and (
+        os.path.isfile(os.path.join(path, "pyproject.toml"))
+        or os.path.isfile(os.path.join(path, "setup.py"))
+    )
 
 
 def read_chunks(

src/pip/_internal/vcs/git.py

@@ -192,8 +192,11 @@ def _should_fetch(cls, dest: str, rev: str) -> bool:
             # Git fetch would fail with abbreviated commits.
             return False
 
-        # Don't fetch if we have the commit locally.
-        return not cls.has_commit(dest, rev)
+        if cls.has_commit(dest, rev):
+            # Don't fetch if we have the commit locally.
+            return False
+
+        return True
 
     @classmethod
     def resolve_revision(