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""" A simple example of using the Qt console with an in-process kernel.
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We shall see how to create the frontend widget, create an in-process kernel,
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push Python objects into the kernel's namespace, and execute code in the
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kernel, both directly and via the frontend widget.
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"""
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from IPython.kernel.inprocess.ipkernel import InProcessKernel
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from IPython.qt.console.rich_ipython_widget import RichIPythonWidget
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from IPython.qt.inprocess_kernelmanager import QtInProcessKernelManager
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from IPython.lib import guisupport
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def main():
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app = guisupport.get_app_qt4()
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# Create a kernel.
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#
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# Setting the GUI is not necessary for the normal operation of the kernel,
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# but it is used for IPython GUI's integration, particularly in pylab. By
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# default, the inline backend is used, which is safe under all toolkits.
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#
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# WARNING: Under no circumstances should another GUI toolkit, like wx, be
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# used when running a Qt application. This will lead to unexpected behavior,
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# including segfaults.
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kernel = InProcessKernel(gui='qt4')
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# Populate the kernel's namespace.
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kernel.shell.push({'x': 0, 'y': 1, 'z': 2})
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# Create a kernel manager for the frontend and register it with the kernel.
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km = QtInProcessKernelManager(kernel=kernel)
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km.start_channels()
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kernel.frontends.append(km)
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# Create the Qt console frontend.
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control = RichIPythonWidget()
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control.exit_requested.connect(app.quit)
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control.kernel_manager = km
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control.show()
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# Execute some code directly. Note where the output appears.
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kernel.shell.run_cell('print "x=%r, y=%r, z=%r" % (x,y,z)')
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# Execute some code through the frontend (once the event loop is
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# running). Again, note where the output appears.
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do_later(control.execute, '%who')
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guisupport.start_event_loop_qt4(app)
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def do_later(func, *args, **kwds):
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from IPython.external.qt import QtCore
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QtCore.QTimer.singleShot(0, lambda: func(*args, **kwds))
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if __name__ == '__main__':
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main()
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