Exclude __pypackages__ by default (GH-2836)

PDM uses this as part of not-accepted-yet PEP 582.

Author: JelleZijlstra

CHANGES.md

@@ -1,5 +1,11 @@
 # Change Log
 
+## Unreleased
+
+### Configuration
+
+- Do not format `__pypackages__` directories by default (#2836)
+
 ## 22.1.0
 
 At long last, _Black_ is no longer a beta product! This is the first non-beta release

src/black/const.py

@@ -1,4 +1,4 @@
 DEFAULT_LINE_LENGTH = 88
-DEFAULT_EXCLUDES = r"/(\.direnv|\.eggs|\.git|\.hg|\.mypy_cache|\.nox|\.tox|\.venv|venv|\.svn|_build|buck-out|build|dist)/"  # noqa: B950
+DEFAULT_EXCLUDES = r"/(\.direnv|\.eggs|\.git|\.hg|\.mypy_cache|\.nox|\.tox|\.venv|venv|\.svn|_build|buck-out|build|dist|__pypackages__)/"  # noqa: B950
 DEFAULT_INCLUDES = r"(\.pyi?|\.ipynb)$"
 STDIN_PLACEHOLDER = "__BLACK_STDIN_FILENAME__"