Fails with conda about rodeo

[jankatins]

If you want to remove your own kernel startup and use one which IPython also uses in some places under the hood:

from IPython.kernel.multikernelmanager import MultiKernelManager
kernel_name = "python"
self.log.info("Starting a new kernel: %s" % kernel_name)
_km = MultiKernelManager(log=self.log, parent=self)
#_km.list_kernel_ids()
kernelid = _km.start_kernel(kernel_name=kernel_name)
kn = _km.get_kernel(kernelid)
kc = kn.client()
# now initalize the channels
kc.start_channels()
kc.wait_for_ready()

[glamp]

what is self.log in that code block?

I tested this out but it got the following error:

Traceback (most recent call last):
  File "rodeo/rodeo.py", line 115, in <module>
    main(directory)
  File "rodeo/rodeo.py", line 96, in main
    kernel = Kernel()
  File "/Users/glamp/repos/yhat/prototypes/rodeo/rodeo/kernel.py", line 81, in __init__
    self._kernel_manager = MultiKernelManager(parent=self)
  File "/usr/local/lib/python2.7/site-packages/IPython/config/configurable.py", line 68, in __init__
    kwargs['config'] = parent.config
AttributeError: 'Kernel' object has no attribute 'config'

Seems like I would still need the config file?

[jankatins]

self is in this case a LoggingConfigurable, which has a logger object at self.log and a config object as self.config (the parent is needed to get config information from the parent to other classes and also access the main log). LoggingConfigurable is quite nice, it gets you the traitlets, logs and the inheritable config and if you use IPython.config.application.Application as the main class for your app you get comamand line handling and such things...

You can probably use it like _km = MultiKernelManager().

See here for the original code: https://github.com/JanSchulz/knitpy/blob/master/knitpy/knitpy.py#L639

[glamp]

is there a way to run it without generating a config file?

[jankatins]

@glamp: _km = MultiKernelManager() (without any parent/argument)?

Yes, a LoggingConfigurable can be used without passing in a parent/config/log, e.g. you can use Knitpy().render(...) directly without having a config object. The config object anyway does not depend on a file, you can build one yourself, if you want (the ipython config files are such a "builder").

[jankatins]

You can also use IPython.kernel.manager.start_new_kernel(....). That might be more appropriate as the UI only handles one kernel at a time.

[Biluoshilang]

I got the error "failed to create process"(in win7) and:
Traceback (most recent call last):
File "rodeo.py", line 1, in
from .kernel import Kernel
SystemError: Parent module '' not loaded, cannot perform relative import

[glamp]

I believe this works now