fix: fix tests for Python 3.9

bumpx/helpers.py

@@ -1,7 +1,7 @@
 import logging
 import shlex
 import subprocess
-from typing import Any
+from typing import Any, Optional
 
 
 class BumprError(Exception):
@@ -15,7 +15,9 @@ def check_output(*args, **kwargs):
     )
 
 
-def execute(command, verbose: bool = False, replacements=None, dryrun: bool = False) -> str | None:
+def execute(
+    command, verbose: bool = False, replacements=None, dryrun: bool = False
+) -> Optional[str]:
     logger = logging.getLogger(__name__)
     replacements = replacements or {}
     if not command:

bumpx/version.py

@@ -1,4 +1,5 @@
 import re
+from typing import Optional
 
 
 class Version:
@@ -41,7 +42,7 @@ def __unicode__(self):
         return pattern.format(**self.__dict__)
 
     @classmethod
-    def parse(cls, string: str) -> "Version" | None:
+    def parse(cls, string: str) -> Optional["Version"]:
         match = cls.PATTERN.match(string)
         if match:
             return cls(**match.groupdict())

tasks.py

@@ -1,5 +1,6 @@
 import os
 import sys
+from typing import Optional
 
 from invoke import task
 
@@ -71,7 +72,7 @@ def error(text: str) -> None:
     sys.stdout.flush()
 
 
-def exit(text: str | None = None, code=-1) -> None:
+def exit(text: Optional[str] = None, code=-1) -> None:
     if text:
         error(text)
     sys.exit(code)