/usr/lib/python2.7/dist-packages/IPython/terminal/pt_inputhooks/qt.py is in python-ipython 5.5.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | import sys
from IPython.external.qt_for_kernel import QtCore, QtGui
# If we create a QApplication, keep a reference to it so that it doesn't get
# garbage collected.
_appref = None
def inputhook(context):
global _appref
app = QtCore.QCoreApplication.instance()
if not app:
_appref = app = QtGui.QApplication([" "])
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
event_loop.exec_()
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(),
QtCore.QSocketNotifier.Read)
# connect the callback we care about before we turn it on
notifier.activated.connect(event_loop.exit)
notifier.setEnabled(True)
# only start the event loop we are not already flipped
if not context.input_is_ready():
event_loop.exec_()
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