You often want a command to have the same name as a function it is wrapping. However, this will cause a name collision, if your command is going to call init_data its function can't also be called init_data. So instead it's written as init_data_command, and then the command name has to be specified manually @command("init-data"). Click should remove a _command suffix when generating the command name from the function name.

def init_data(external=False):
    ...

@cli.command
@click.option("--external/--internal")
def init_data_command(external):
    init_data(external=external)

Currently this command would be named init-data-command. After the change, it would be init-data.