make black build dep optional

.github/workflows/ci.yml

@@ -173,7 +173,7 @@ jobs:
       with:
         python-version: '3.10'
 
-    - run: pip install 'black>=22.3.0,<23' typing_extensions
+    - run: pip install typing_extensions
     - run: make rust-benchmark
 
   build-wasm-emscripten:

generate_self_schema.py

@@ -11,9 +11,9 @@
 from collections.abc import Callable
 from datetime import date, datetime, time, timedelta
 from pathlib import Path
+from pprint import pformat
 from typing import TYPE_CHECKING, Any, Dict, ForwardRef, List, Type, Union
 
-from black import Mode, TargetVersion, format_file_contents
 from typing_extensions import get_args, is_typeddict
 
 try:
@@ -169,15 +169,21 @@ def main() -> None:
         'choices': choices,
     }
     python_code = (
-        f'# this file is auto-generated by generate_self_schema.py, DO NOT edit manually\nself_schema = {schema}\n'
+        f'# this file is auto-generated by generate_self_schema.py, DO NOT edit manually\n'
+        f'self_schema = {pformat(schema)}\n'
     )
-    mode = Mode(
-        line_length=120,
-        string_normalization=False,
-        magic_trailing_comma=False,
-        target_versions={TargetVersion.PY37, TargetVersion.PY38, TargetVersion.PY39, TargetVersion.PY310},
-    )
-    python_code = format_file_contents(python_code, fast=False, mode=mode)
+    try:
+        from black import Mode, TargetVersion, format_file_contents
+    except ImportError:
+        pass
+    else:
+        mode = Mode(
+            line_length=120,
+            string_normalization=False,
+            magic_trailing_comma=False,
+            target_versions={TargetVersion.PY37, TargetVersion.PY38, TargetVersion.PY39, TargetVersion.PY310},
+        )
+        python_code = format_file_contents(python_code, fast=False, mode=mode)
     SAVE_PATH.write_text(python_code)
     print(f'Self schema definition written to {SAVE_PATH}')
 

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ['maturin>=0.13,<0.14', 'black>=22.3.0,<23', 'typing_extensions']
+requires = ['maturin>=0.13,<0.14', 'typing_extensions']
 build-backend = 'maturin'
 
 [project]