Fix QByteArray to bytes conversion

CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ### Added
 * [#138](https://github.com/python-qt-tools/PyQt5-stubs/pull/138) update to PyQt5 5.15.3
 * [#144](https://github.com/python-qt-tools/PyQt5-stubs/pull/144) add `QTreeWidgetItem.__lt__()` to allow sorting of items in a QTreeWidget
+* [#143](https://github.com/python-qt-tools/PyQt5-stubs/pull/143) make `bytes(QByteArray())` valid by incorrectly adding `.__bytes__()` until a proper solution is developed upstream
 
 ## 5.15.2.0
 

PyQt5-stubs/QtCore.pyi

@@ -3746,6 +3746,15 @@ class QByteArray(sip.simplewrapper):
     @typing.overload
     def __init__(self, a: typing.Union['QByteArray', bytes, bytearray]) -> None: ...
 
+    # TODO: this is a lie...  :|  it is actually the buffer C-api that is
+    #       implemented. see the discussions below and correct this when a
+    #       proper fix is available.
+    #
+    #   	https://github.com/python-qt-tools/PyQt5-stubs/pull/143
+    #       https://github.com/python/typing/issues/593
+    #       https://bugs.python.org/issue27501
+    def __bytes__(self) -> bytes: ...
+
     @staticmethod
     def fromBase64Encoding(base64: typing.Union['QByteArray', bytes, bytearray], options: typing.Union['QByteArray.Base64Options', 'QByteArray.Base64Option'] = ...) -> 'QByteArray.FromBase64Result': ...
     def isLower(self) -> bool: ...

stubtest.allowlist.to_review

@@ -1,6 +1,7 @@
 PyQt5.QtBluetooth.QBluetoothDeviceInfo.Field.__new__
 PyQt5.QtCore.QAbstractItemModel.CheckIndexOption.__new__
 PyQt5.QtCore.QByteArray.Base64DecodingStatus.__new__
+PyQt5.QtCore.QByteArray.__bytes__
 PyQt5.QtCore.QCalendar.System.__new__
 PyQt5.QtCore.QCborKnownTags.__new__
 PyQt5.QtCore.QCborSimpleType.__new__

tests/qbytearray.py

@@ -0,0 +1,7 @@
+import typing
+from PyQt5 import QtCore
+
+some_bytearray = QtCore.QByteArray(3, 'a')
+some_bytes = bytes(some_bytearray)	# type: bytes
+
+