Python Click:如何打印关于使用错误的完整帮助详细信息?

这可以通过猴子修补来完成 UsageError

import click
from click.exceptions import UsageError
from click._compat import get_text_stderr
from click.utils import echo


def _show_usage_error(self, file=None):
    if file is None:
        file = get_text_stderr()
    color = None
    if self.ctx is not None:
        color = self.ctx.color
        echo(self.ctx.get_help() + '\n', file=file, color=color)
    echo('Error: %s' % self.format_message(), file=file, color=color)


UsageError.show = _show_usage_error


@click.group()
@click.pass_context
def cli(ctx):
    ctx.obj = {}

@cli.command()
@click.argument('my_arg')
@click.pass_context
@report_errors
def foo(ctx, my_arg):
  # some stuff here