如何创建带有2个或多个参数的自定义Flask命令？
如何创建带有2个或多个参数的自定义Flask命令？
提问于 2020-08-15 11:51:44
我想做一个自定义的烧瓶CLI命令。当我只使用一个参数时，它工作得很好，但是对于2个或更多的参数，它不起作用。我正在使用下面的代码，对于2个或多个参数，它会失败：
# Usage: flask power 2 3
# Output: 6
@app.cli.command()
@click.argument('x','y')
def power(x, y):
print(int(x)**int(y))下面的代码只使用一个参数就可以正常工作
# Usage: flask power 2
# Output: 6
@app.cli.command()
@click.argument('x')
def power(x):
print(int(x)**3)使用2个或多个参数代码再现的错误是：
flask power 2 3
Traceback (most recent call last):
File "/home/user/.local/bin/flask", line 8, in <module>
sys.exit(main())
File "/home/user/.local/lib/python3.5/site-packages/flask/cli.py", line 894, in main
cli.main(args=args, prog_name=name)
File "/home/user/.local/lib/python3.5/site-packages/flask/cli.py", line 557, in main
return super(FlaskGroup, self).main(*args, **kwargs)
File "/home/user/.local/lib/python3.5/site-packages/click/core.py", line 782, in main
rv = self.invoke(ctx)
File "/home/user/.local/lib/python3.5/site-packages/click/core.py", line 1254, in invoke
cmd_name, cmd, args = self.resolve_command(ctx, args)
File "/home/user/.local/lib/python3.5/site-packages/click/core.py", line 1297, in resolve_command
cmd = self.get_command(ctx, cmd_name)
File "/home/user/.local/lib/python3.5/site-packages/flask/cli.py", line 515, in get_command
rv = info.load_app().cli.get_command(ctx, name)
File "/home/user/.local/lib/python3.5/site-packages/flask/cli.py", line 372, in load_app
app = locate_app(self, import_name, name)
File "/home/user/.local/lib/python3.5/site-packages/flask/cli.py", line 235, in locate_app
__import__(module_name)
File "/projects/challenge/myflaskproj/__init__.py", line 6, in <module>
from myflaskproj.commands import power, repeat
File "/projects/challenge/myflaskproj/commands.py", line 6, in <module>
@click.argument('x','y')
File "/home/user/.local/lib/python3.5/site-packages/click/decorators.py", line 168, in decorator
_param_memo(f, ArgumentClass(param_decls, **attrs))
File "/home/user/.local/lib/python3.5/site-packages/click/core.py", line 1984, in __init__
Parameter.__init__(self, param_decls, required=required, **attrs)
File "/home/user/.local/lib/python3.5/site-packages/click/core.py", line 1483, in __init__
param_decls or (), expose_value
File "/home/user/.local/lib/python3.5/site-packages/click/core.py", line 2019, in _parse_decls
" {}".format(len(decls))
TypeError: Arguments take exactly one parameter declaration, got 2如何使命令在此方法中接受2个参数？我是不是在哪里搞错了？我将非常感谢你的帮助。
我看到了一些使用BluePrint的解决方案，我不想使用蓝图让我的工作运行！以上代码使用简单方便。我不知道我在哪里做错了什么！额外的帮助是非常感谢的！
回答 1
Stack Overflow用户
回答已采纳
发布于 2020-08-15 15:07:57
@click.arguments不以这种方式接受多个参数。
相反，使用
@app.cli.command()
@click.argument('x', nargs=1)
@click.argument('y', nargs=1)
def power(x, y):
print(int(x)**int(y))请参阅文档这里。
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原文链接：
https://stackoverflow.com/questions/63425726
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