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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import subprocess
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import sys
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from IPython.lib.kernel import connect_qtconsole
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from IPython.kernel.zmq.kernelapp import IPKernelApp
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#-----------------------------------------------------------------------------
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# Functions and classes
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#-----------------------------------------------------------------------------
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def pylab_kernel(gui):
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"""Launch and return an IPython kernel with pylab support for the desired gui
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"""
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kernel = IPKernelApp.instance()
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kernel.initialize(['python', '--pylab=%s' % gui,
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#'--log-level=10'
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])
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return kernel
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class InternalIPKernel(object):
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def init_ipkernel(self, backend):
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# Start IPython kernel with GUI event loop and pylab support
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self.ipkernel = pylab_kernel(backend)
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# To create and track active qt consoles
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self.consoles = []
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# This application will also act on the shell user namespace
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self.namespace = self.ipkernel.shell.user_ns
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# Keys present at startup so we don't print the entire pylab/numpy
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# namespace when the user clicks the 'namespace' button
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self._init_keys = set(self.namespace.keys())
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# Example: a variable that will be seen by the user in the shell, and
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# that the GUI modifies (the 'Counter++' button increments it):
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self.namespace['app_counter'] = 0
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#self.namespace['ipkernel'] = self.ipkernel # dbg
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def print_namespace(self, evt=None):
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print("\n***Variables in User namespace***")
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for k, v in self.namespace.iteritems():
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if k not in self._init_keys and not k.startswith('_'):
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print('%s -> %r' % (k, v))
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sys.stdout.flush()
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def new_qt_console(self, evt=None):
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"""start a new qtconsole connected to our kernel"""
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return connect_qtconsole(self.ipkernel.connection_file, profile=self.ipkernel.profile)
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def count(self, evt=None):
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self.namespace['app_counter'] += 1
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def cleanup_consoles(self, evt=None):
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for c in self.consoles:
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c.kill()
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