Work with Jupyter server extensions

Subcommands
===========
Subcommands are launched as `jupyter nbclassic-serverextension cmd [args]`. For
information on using subcommand 'cmd', do: `jupyter nbclassic-serverextension
cmd -h`.

enable
    Enable a server extension
disable
    Disable a server extension
list
    List server extensions

Options
=======
The options below are convenience aliases to configurable class-options,
as listed in the "Equivalent to" description-line of the aliases.
To see all configurable class-options for some <cmd>, use:
    <cmd> --help-all

--debug
    set log level to logging.DEBUG (maximize logging output)
    Equivalent to: [--Application.log_level=10]
--show-config
    Show the application's configuration (human-readable format)
    Equivalent to: [--Application.show_config=True]
--show-config-json
    Show the application's configuration (json format)
    Equivalent to: [--Application.show_config_json=True]
--user
    Apply the operation only for the given user
    Equivalent to: [--BaseExtensionApp.user=True]
--system
    Apply the operation system-wide
    Equivalent to: [--BaseExtensionApp.user=False --BaseExtensionApp.sys_prefix=False]
--sys-prefix
    Use sys.prefix as the prefix for installing nbextensions (for environments, packaging)
    Equivalent to: [--BaseExtensionApp.sys_prefix=True]
--py
    Install from a Python package
    Equivalent to: [--BaseExtensionApp.python=True]
--python
    Install from a Python package
    Equivalent to: [--BaseExtensionApp.python=True]
--log-level=<Enum>
    Set the log level by value or name.
    Choices: any of [0, 10, 20, 30, 40, 50, 'DEBUG', 'INFO', 'WARN', 'ERROR', 'CRITICAL']
    Default: 30
    Equivalent to: [--Application.log_level]
--config=<Unicode>
    Full path of a config file.
    Default: ''
    Equivalent to: [--JupyterApp.config_file]

Examples
--------

    jupyter nbclassic-serverextension list                        # list all configured server extensions
    jupyter nbclassic-serverextension enable --py <packagename>   # enable all server extensions in a Python package
    jupyter nbclassic-serverextension disable --py <packagename>  # disable all server extensions in a Python package

To see all available configurables, use `--help-all`.