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Backport PR #10489: Prefer execution when there's only a single line entered...
Backport PR #10489: Prefer execution when there's only a single line entered Closes gh-10425 The heuristic here is to treat a single line specially, and always evaluate it as if the cursor was at the end. An alternative heuristic could be to do this if the cursor is on the last line of the input. This could also cause some weird effects if you e.g. type `for a in range(5):`, move the cursor back a few places and press enter - you'll get a newline inserted in the text, but it will indent as if it were after the colon. I'm still trying to think if there's a better way to approach it.

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qt.py
35 lines | 1.3 KiB | text/x-python | PythonLexer
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_()