some are supported out of the box: str / click.STRING: The default parameter type which indicates unicode strings. int / click.INT: A parameter that only accepts integers. float / click.FLOAT: A parameter to represent the path. The default is None which means the return value will be either bytes or unicode depending on what makes most sense given the input data Click deals with. class click.Choice(choices) supports this through the click.File type which intelligently handles files for you. It also deals with Unicode and bytes correctly for all versions of Python so your script stays very portable. Example: @click

notebook --help Application.log_datefmt [Unicode] Default: '%Y-%m-%d %H:%M:%S' The date format used by logging formatters for %(asctime)s Application.log_format [Unicode] Default: '[%(name)s]%(highlevel)s False Answer yes to any prompts. JupyterApp.config_file [Unicode] Default: '' Full path of a config file. JupyterApp.config_file_name [Unicode] Default: '' Specify a config file to load. JupyterApp config file. JupyterApp.log_datefmt [Unicode] Default: '%Y-%m-%d %H:%M:%S' The date format used by logging formatters for %(asctime)s JupyterApp.log_format [Unicode] Default: '[%(name)s]%(highlevel)s %(message)s'

subprocesses • Fix cross-origin problems • Fix double-escaping of the base URL prefix • Handle invalid unicode filenames more gracefully • Fix ANSI color-processing • Send keepalive messages for web terminals --help Application.log_datefmt [Unicode] Default: '%Y-%m-%d %H:%M:%S' The date format used by logging formatters for %(asctime)s Application.log_format [Unicode] Default: '[%(name)s]%(highlevel)s False Answer yes to any prompts. JupyterApp.config_file [Unicode] Default: '' Full path of a config file. JupyterApp.config_file_name [Unicode] Default: '' Specify a config file to load. JupyterApp

subprocesses • Fix cross-origin problems • Fix double-escaping of the base URL prefix • Handle invalid unicode filenames more gracefully • Fix ANSI color-processing • Send keepalive messages for web terminals --help Application.log_datefmt [Unicode] Default: '%Y-%m-%d %H:%M:%S' The date format used by logging formatters for %(asctime)s Application.log_format [Unicode] Default: '[%(name)s]%(highlevel)s False Answer yes to any prompts. JupyterApp.config_file [Unicode] Default: '' Full path of a config file. JupyterApp.config_file_name [Unicode] Default: '' Specify a config file to load. JupyterApp

subprocesses • Fix cross-origin problems • Fix double-escaping of the base URL prefix • Handle invalid unicode filenames more gracefully • Fix ANSI color-processing • Send keepalive messages for web terminals notebook --help Application.log_datefmt [Unicode] Default: '%Y-%m-%d %H:%M:%S' The date format used by logging formatters for %(asctime)s Application.log_format [Unicode] Default: '[%(name)s]%(highlevel)s prompts. JupyterApp.config_file [Unicode] Default: '' Full path of a config file. 109 Jupyter Notebook Documentation, Release 6.4.10 JupyterApp.config_file_name [Unicode] Default: '' Specify a config

subprocesses • Fix cross-origin problems • Fix double-escaping of the base URL prefix • Handle invalid unicode filenames more gracefully • Fix ANSI color-processing • Send keepalive messages for web terminals notebook --help Application.log_datefmt [Unicode] Default: '%Y-%m-%d %H:%M:%S' The date format used by logging formatters for %(asctime)s Application.log_format [Unicode] Default: '[%(name)s]%(highlevel)s prompts. JupyterApp.config_file [Unicode] Default: '' Full path of a config file. 111 Jupyter Notebook Documentation, Release 6.4.11 JupyterApp.config_file_name [Unicode] Default: '' Specify a config

subprocesses • Fix cross-origin problems • Fix double-escaping of the base URL prefix • Handle invalid unicode filenames more gracefully • Fix ANSI color-processing • Send keepalive messages for web terminals notebook --help Application.log_datefmt [Unicode] Default: '%Y-%m-%d %H:%M:%S' The date format used by logging formatters for %(asctime)s Application.log_format [Unicode] Default: '[%(name)s]%(highlevel)s prompts. JupyterApp.config_file [Unicode] Default: '' Full path of a config file. 109 Jupyter Notebook Documentation, Release 6.4.9 JupyterApp.config_file_name [Unicode] Default: '' Specify a config

subprocesses • Fix cross-origin problems • Fix double-escaping of the base URL prefix • Handle invalid unicode filenames more gracefully • Fix ANSI color-processing • Send keepalive messages for web terminals notebook --help Application.log_datefmt [Unicode] Default: '%Y-%m-%d %H:%M:%S' The date format used by logging formatters for %(asctime)s Application.log_format [Unicode] Default: '[%(name)s]%(highlevel)s False Answer yes to any prompts. JupyterApp.config_file [Unicode] Default: '' Full path of a config file. JupyterApp.config_file_name [Unicode] Default: '' Specify a config file to load. JupyterApp

subprocesses • Fix cross-origin problems • Fix double-escaping of the base URL prefix • Handle invalid unicode filenames more gracefully • Fix ANSI color-processing • Send keepalive messages for web terminals notebook --help Application.log_datefmt [Unicode] Default: '%Y-%m-%d %H:%M:%S' The date format used by logging formatters for %(asctime)s Application.log_format [Unicode] Default: '[%(name)s]%(highlevel)s prompts. JupyterApp.config_file [Unicode] Default: '' Full path of a config file. 109 Jupyter Notebook Documentation, Release 6.4.6 JupyterApp.config_file_name [Unicode] Default: '' Specify a config

subprocesses • Fix cross-origin problems • Fix double-escaping of the base URL prefix • Handle invalid unicode filenames more gracefully • Fix ANSI color-processing • Send keepalive messages for web terminals --help Application.log_datefmt [Unicode] Default: '%Y-%m-%d %H:%M:%S' The date format used by logging formatters for %(asctime)s Application.log_format [Unicode] Default: '[%(name)s]%(highlevel)s False Answer yes to any prompts. JupyterApp.config_file [Unicode] Default: '' Full path of a config file. JupyterApp.config_file_name [Unicode] Default: '' Specify a config file to load. JupyterApp