用xh列出理解(List comprehension with xh)

用xh列出理解(List comprehension with xh)

我还是新手，但是可以使用list-comprehension语法在xh执行多个命令吗？

我希望以下内容创建五个文件file00到file04 ，但它错误：

$ [@(['touch', 'file%02d' % i]) for i in range(5)] ............................ xh: For full traceback set: $XOSH_SHOW_TRACEBACK = True File "<string>", line one SyntaxError: <xh-code>:1:1: ('code: @(',) [@(['touch', 'file%02d' % i]) for i in range(5)] ^

我希望这可行，因为以下工作正常：

$ [i for i in range(5)] [0, 1, 2, , 4] $ @(['touch', 'file%02d' % ]) $ ls file0

I am still new to this, but is it possible to execute multiple commands in xh using a list-comprehension syntax?

I would expect the following to create five files file00 to file04, but it errors instead:

$ [@(['touch', 'file%02d' % i]) for i in range(5)] ............................ xh: For full traceback set: $XOSH_SHOW_TRACEBACK = True File "<string>", line one SyntaxError: <xh-code>:1:1: ('code: @(',) [@(['touch', 'file%02d' % i]) for i in range(5)] ^

I would expect this to work, because the following works fine:

$ [i for i in range(5)] [0, 1, 2, , 4] $ @(['touch', 'file%02d' % ]) $ ls file0

最满意答案

最接近原始代码的方法是使用子进程：

[$[touch @('file%02d' % i)] for i in range(5)]

为了解释嵌套$[ .. @( ：

顶级命令是列表理解，所以我们从Python模式开始; 我们想要执行一个bash命令（ touch ），所以我们需要用$[ （或$(捕获输出）进入子进程模式; 但是该命令的参数需要使用Python进行字符串插值，因此再次使用@( 。

The way closest to your original code is to use a subprocess:

[$[touch @('file%02d' % i)] for i in range(5)]

To explain the need for nesting $[ .. @(:

The top-level command is a list-comprehension, so we start in Python-mode; We want to execute a bash command (touch) so we need to enter subprocess-mode with $[ (or $( to capture output); But the argument to that command requires string interpolation with Python, hence Python-mode again with @(.