bokeh.command.subcommand

Provides a base class for defining subcommands of the Bokeh command line application.

class Subcommand(parser: ArgumentParser)

Abstract base class for subcommands

Subclasses should implement an invoke(self, args) method that accepts a set of argparse processed arguments as input.

Subclasses should also define the following class attributes:

• name a name for this subcommand

• help a help string for argparse to use for this subcommand

• args the parameters to pass to parser.add_argument

The format of the args should be a sequence of tuples of the form:

('argname', Argument(
    metavar='ARGNAME',
    nargs='+',
))

Example

A simple subcommand “foo” might look like this:

class Foo(Subcommand):

    name = "foo"
    help = "performs the Foo action"
    args = (
        ('--yell', Argument(
            action='store_true',
            help="Make it loud",
        )),
    )

    def invoke(self, args):
        if args.yell:
            print("FOO!")
        else:
            print("foo")

Then executing bokeh foo --yell would print FOO! at the console.

__init__(parser: ArgumentParser) → None

Initialize the subcommand with its parser

Parameters

parser (Parser) – an Argparse Parser instance to configure with the args for this subcommand.

This method will automatically add all the arguments described in self.args. Subclasses can perform any additional customizations on self.parser.

abstract invoke(args: Namespace) → Optional[bool]

Takes over main program flow to perform the subcommand.

This method must be implemented by subclasses. subclassed overwritten methods return different types: bool: Build None: FileOutput (subclassed by HTML, SVG and JSON. PNG overwrites FileOutput.invoke method), Info, Init, Sampledata, Secret, Serve, Static

Parameters

args (argparse.Namespace) – command line arguments for the subcommand to parse

Raises

NotImplementedError –