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"""An internal ipykernel example."""
# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------
import sys
from IPython.lib.kernel import connect_qtconsole
from ipykernel.kernelapp import IPKernelApp
# -----------------------------------------------------------------------------
# Functions and classes
# -----------------------------------------------------------------------------
def mpl_kernel(gui):
"""Launch and return an IPython kernel with matplotlib support for the desired gui"""
kernel = IPKernelApp.instance()
kernel.initialize(
[
"python",
"--matplotlib=%s" % gui,
#'--log-level=10'
]
)
return kernel
class InternalIPKernel:
"""An internal ipykernel class."""
def init_ipkernel(self, backend):
"""Start IPython kernel with GUI event loop and mpl support."""
self.ipkernel = mpl_kernel(backend)
# To create and track active qt consoles
self.consoles = []
# This application will also act on the shell user namespace
self.namespace = self.ipkernel.shell.user_ns
# Example: a variable that will be seen by the user in the shell, and
# that the GUI modifies (the 'Counter++' button increments it):
self.namespace["app_counter"] = 0
# self.namespace['ipkernel'] = self.ipkernel # dbg
def print_namespace(self, evt=None):
"""Print the namespace."""
print("\n***Variables in User namespace***")
for k, v in self.namespace.items():
if not k.startswith("_"):
print(f"{k} -> {v!r}")
sys.stdout.flush()
def new_qt_console(self, evt=None):
"""start a new qtconsole connected to our kernel"""
return connect_qtconsole(self.ipkernel.abs_connection_file, profile=self.ipkernel.profile)
def count(self, evt=None):
"""Get the app counter value."""
self.namespace["app_counter"] += 1
def cleanup_consoles(self, evt=None):
"""Clean up the consoles."""
for c in self.consoles:
c.kill()
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