Restore Python 3.8 compatibility.

pytest_perf/compat/py38.py

@@ -0,0 +1,24 @@
+import sys
+
+
+if sys.version_info < (3, 9):
+
+    def removesuffix(self, suffix):
+        # suffix='' should not call self[:-0].
+        if suffix and self.endswith(suffix):
+            return self[: -len(suffix)]
+        else:
+            return self[:]
+
+    def removeprefix(self, prefix):
+        if self.startswith(prefix):
+            return self[len(prefix) :]
+        else:
+            return self[:]
+else:
+
+    def removesuffix(self, suffix):
+        return self.removesuffix(suffix)
+
+    def removeprefix(self, prefix):
+        return self.removeprefix(prefix)

pytest_perf/runner.py

@@ -4,6 +4,8 @@
 import contextlib
 import tempfile
 
+from .compat.py38 import removesuffix
+
 import pip_run
 import tempora
 
@@ -119,7 +121,7 @@ def upstream_url(extras='', control=None):
     origin = subprocess.check_output(_git_origin, encoding='utf-8', text=True).strip()
     origin_url = _ensure_url(origin)
     base, sep, name = origin.rpartition('/')
-    clean_name = name.removesuffix('.git')
+    clean_name = removesuffix(name, '.git')
     rev = f'@{control}' if control else ''
     return f'{clean_name}{extras}@git+{origin_url}{rev}'