"Sort key function that will put strings starting with 'python' first."

if s.startswith('python'):

# Space is not valid in kernel names, so this should sort first

return ' ' + s

description = """List installed kernel specifications."""

kernel_spec_manager = Instance(KernelSpecManager)

# Not all of the base aliases are meaningful (e.g. profile)

aliases = {k: base_aliases[k] for k in ['ipython-dir', 'log-level']}

flags = {'debug': base_flags['debug'],}

def _kernel_spec_manager_default(self):

return KernelSpecManager(ipython_dir=self.ipython_dir)

def start(self):

print("Available kernels:")

for kernelname in sorted(self.kernel_spec_manager.find_kernel_specs(),

key=_pythonfirst):

description = """Install a kernel specification directory."""

kernel_spec_manager = Instance(KernelSpecManager)

def _kernel_spec_manager_default(self):

return KernelSpecManager(ipython_dir=self.ipython_dir)

sourcedir = Unicode()

kernel_name = Unicode("", config=True,

help="Install the kernel spec with this name"

)

def _kernel_name_default(self):

return os.path.basename(self.sourcedir)

system = Bool(False, config=True,

help="""

)

replace = Bool(False, config=True,

help="Replace any existing kernel spec with this name."

)

aliases = {'name': 'InstallKernelSpec.kernel_name'}

for k in ['ipython-dir', 'log-level']:

aliases[k] = base_aliases[k]

flags = {'system': ({'InstallKernelSpec': {'system': True}},

"Install to the systemwide kernel registry"),

'replace': ({'InstallKernelSpec': {'replace': True}},

"Replace any existing kernel spec with this name."),

'debug': base_flags['debug'],

}

def parse_command_line(self, argv):

super(InstallKernelSpec, self).parse_command_line(argv)

# accept positional arg as profile name

if self.extra_args:

self.sourcedir = self.extra_args[0]

else:

print("No source directory specified.")

self.exit(1)

def start(self):

try:

self.kernel_spec_manager.install_kernel_spec(self.sourcedir,

kernel_name=self.kernel_name,

system=self.system,

replace=self.replace,

)

except OSError as e:

if e.errno == errno.EACCES:

print("Permission denied")

self.exit(1)

elif e.errno == errno.EEXIST:

print("A kernel spec is already present at %s" % e.filename)

self.exit(1)

name = "ipython kernelspec"

description = """Manage IPython kernel specifications."""

subcommands = Dict(dict(

list = (ListKernelSpecs, ListKernelSpecs.description.splitlines()[0]),

install = (InstallKernelSpec, InstallKernelSpec.description.splitlines()[0])

))

aliases = {}

flags = {}

def start(self):

if self.subapp is None:

print("No subcommand specified. Must specify one of: %s"% list(self.subcommands))

print()

self.print_description()

self.print_subcommands()

self.exit(1)

else: