@click.command(cls=ShowUsageOnMissingError)
@click.option("-o", help="Output file where data is written.", required=True)
def cli(o):
click.echo(o)
if __name__ == "__main__":
commands = (
'-o outfile',
'',
' help',
)
import sys, time
time.sleep(1)
print('Click Version: {}'.format(click.__version__))
print('Python Version: {}'.format(sys.version))
for cmd in commands:
try:
time.sleep(0.1)
print(' -')
print('> ' + cmd)
time.sleep(0.1)
cli(cmd.split(), obj={})
except BaseException as exc:
if str(exc) != '0' and \
not isinstance(exc, (click.ClickException, SystemExit)):
raise
结果
Click Version: 6.7
Python Version: 3.6.2 (default, Jul 17 2017, 23:14:31)
[GCC 5.4.0 20160609]
-
> -o outfile
outfile
-
>
Error: Missing option "-o".
Usage: test.py [OPTIONS]
Options:
-o TEXT Output file where data is written. [required]
help Show this message and exit.
-
> help
Usage: test.py [OPTIONS]
Options:
-o TEXT Output file where data is written. [required]
help Show this message and exit.
您可以挂接命令调用,然后根据需要显示帮助,如下所示:
自定义命令类
使用自定义类
要使用自定义类,只需将该类传递给
^{pr2}$click.command()
修饰符,如下所示:这是怎么回事?
这是因为click是一个设计良好的OO框架。
@click.command()
修饰符通常实例化一个click.Command
对象,但允许使用cls
参数覆盖此行为。因此,在我们自己的类中从click.Command
继承并超越所需的方法是一件相对容易的事情。在在本例中,我们重写
__call__()
,并在打印异常后打印帮助。在测试代码
结果
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