Add support for Python 3.14

Resolves #35

Author: davidfstr

.github/workflows/ci.yaml

@@ -7,7 +7,7 @@ jobs:
       matrix:
         # All available versions of Python:
         # https://github.com/actions/python-versions/blob/main/versions-manifest.json
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
       fail-fast: false
     steps:
       - name: Checkout code

README.md

@@ -524,6 +524,10 @@ raised exceptions, and other details.
 
 * See the [Roadmap](https://github.com/davidfstr/trycast/wiki/Roadmap).
 
+### main (v1.3.0)
+
+* Add support for Python 3.14.
+
 ### v1.2.1
 
 * Fix `checkcast()` to declare that it returns a `T` rather than `T | None`.

pyproject.toml

@@ -21,6 +21,8 @@ classifiers = [  # https://pypi.org/classifiers/
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Topic :: Software Development",
     "Typing :: Typed"
 ]
@@ -87,7 +89,7 @@ line_length = 88
 legacy_tox_ini = """
 
 [tox]
-envlist = py38,py39,py310,py311,py312
+envlist = py38,py39,py310,py311,py312,py313,py314
 isolated_build = True
 
 [testenv]

tests.py

@@ -2,6 +2,7 @@
 import functools
 import os
 import platform
+import re
 import subprocess
 import sys
 import typing
@@ -2880,15 +2881,43 @@ def assertRaisesEqual(
 
     @staticmethod
     def _typing_error_messages(template: str) -> List[str]:
-        python_lt_3_9 = (
-            template.replace("Literal", "typing.Literal")
-            .replace("NoReturn", "typing.NoReturn")
-            .replace("Union", "typing.Union")
-        )
-        return [
-            template,
-            python_lt_3_9,  # for Python <=3.9
-        ]
+        # In Python 3.14+, Union[T1, T2] is represented as "T1 | T2" instead of "Union[T1, T2]".
+        if sys.version_info >= (3, 14):
+            # Convert "Union[...]" to "... | ..." format
+            def convert_union(match: "re.Match[str]") -> str:
+                content = match.group(1)
+                # Split by comma but not within brackets
+                parts = []
+                bracket_depth = 0
+                current_part = []
+                for char in content:
+                    if char in "[<(":
+                        bracket_depth += 1
+                        current_part.append(char)
+                    elif char in "]>)":
+                        bracket_depth -= 1
+                        current_part.append(char)
+                    elif char == "," and bracket_depth == 0:
+                        parts.append("".join(current_part).strip())
+                        current_part = []
+                    else:
+                        current_part.append(char)
+                parts.append("".join(current_part).strip())
+                return " | ".join(parts)
+
+            converted = re.sub(r"Union\[([^\]]+)\]", convert_union, template)
+            return [converted]
+        elif sys.version_info >= (3, 10):
+            # Python 3.10 - 3.13
+            return [template]
+        else:
+            # Python <=3.9
+            python_lt_3_9 = (
+                template.replace("Literal", "typing.Literal")
+                .replace("NoReturn", "typing.NoReturn")
+                .replace("Union", "typing.Union")
+            )
+            return [python_lt_3_9]
 
 
 class TestValidationError(TestCase):