first commit

.venv/Lib/site-packages/IPython/terminal/pt_inputhooks/qt.py

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+import sys
+import os
+from IPython.external.qt_for_kernel import QtCore, QtGui, enum_helper
+from IPython import get_ipython
+
+# If we create a QApplication, keep a reference to it so that it doesn't get
+# garbage collected.
+_appref = None
+_already_warned = False
+
+
+def _exec(obj):
+    # exec on PyQt6, exec_ elsewhere.
+    obj.exec() if hasattr(obj, "exec") else obj.exec_()
+
+
+def _reclaim_excepthook():
+    shell = get_ipython()
+    if shell is not None:
+        sys.excepthook = shell.excepthook
+
+
+def inputhook(context):
+    global _appref
+    app = QtCore.QCoreApplication.instance()
+    if not app:
+        if sys.platform == 'linux':
+            if not os.environ.get('DISPLAY') \
+                    and not os.environ.get('WAYLAND_DISPLAY'):
+                import warnings
+                global _already_warned
+                if not _already_warned:
+                    _already_warned = True
+                    warnings.warn(
+                        'The DISPLAY or WAYLAND_DISPLAY environment variable is '
+                        'not set or empty and Qt5 requires this environment '
+                        'variable. Deactivate Qt5 code.'
+                    )
+                return
+        try:
+            QtCore.QApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling)
+        except AttributeError:  # Only for Qt>=5.6, <6.
+            pass
+        try:
+            QtCore.QApplication.setHighDpiScaleFactorRoundingPolicy(
+                QtCore.Qt.HighDpiScaleFactorRoundingPolicy.PassThrough
+            )
+        except AttributeError:  # Only for Qt>=5.14.
+            pass
+        _appref = app = QtGui.QApplication([" "])
+
+        # "reclaim" IPython sys.excepthook after event loop starts
+        # without this, it defaults back to BaseIPythonApplication.excepthook
+        # and exceptions in the Qt event loop are rendered without traceback
+        # formatting and look like "bug in IPython".
+        QtCore.QTimer.singleShot(0, _reclaim_excepthook)
+
+    event_loop = QtCore.QEventLoop(app)
+
+    if sys.platform == 'win32':
+        # The QSocketNotifier method doesn't appear to work on Windows.
+        # Use polling instead.
+        timer = QtCore.QTimer()
+        timer.timeout.connect(event_loop.quit)
+        while not context.input_is_ready():
+            timer.start(50)  # 50 ms
+            _exec(event_loop)
+            timer.stop()
+    else:
+        # On POSIX platforms, we can use a file descriptor to quit the event
+        # loop when there is input ready to read.
+        notifier = QtCore.QSocketNotifier(
+            context.fileno(), enum_helper("QtCore.QSocketNotifier.Type").Read
+        )
+        try:
+            # connect the callback we care about before we turn it on
+            # lambda is necessary as PyQT inspect the function signature to know
+            # what arguments to pass to. See https://github.com/ipython/ipython/pull/12355
+            notifier.activated.connect(lambda: event_loop.exit())
+            notifier.setEnabled(True)
+            # only start the event loop we are not already flipped
+            if not context.input_is_ready():
+                _exec(event_loop)
+        finally:
+            notifier.setEnabled(False)