在 Python 中按顺序执行命令?

问题描述：

我想连续执行多个命令:

I would like to execute multiple commands in a row:

即(只是为了说明我的需要):

i.e. (just to illustrate my need):

cmd(外壳)

然后

cd 目录

和

ls

并读取ls的结果.

对 subprocess 模块有什么想法吗?

Any idea with subprocess module?

更新:

cd dir 和 ls 只是一个例子.我需要运行复杂的命令(遵循特定的顺序，没有任何流水线).事实上，我想要一个子进程 shell 并且能够在它上面启动许多命令.

cd dir and ls are just an example. I need to run complex commands (following a particular order, without any pipelining). In fact, I would like one subprocess shell and the ability to launch many commands on it.

答

有一种简单的方法可以执行一系列命令.

There is an easy way to execute a sequence of commands.

在subprocess.Popen

"command1; command2; command3"

或者，如果您一直使用 Windows，您有多种选择.

Or, if you're stuck with windows, you have several choices.

创建一个临时的.BAT"文件，并将其提供给 subprocess.Popen

在单个长字符串中创建一系列带有\n"分隔符的命令.

Create a sequence of commands with "\n" separators in a single long string.

像这样使用"".

"""
command1
command2
command3
"""

或者，如果你必须做一些零碎的事情，你必须做这样的事情.

Or, if you must do things piecemeal, you have to do something like this.

class Command( object ):
    def __init__( self, text ):
        self.text = text
    def execute( self ):
        self.proc= subprocess.Popen( ... self.text ... )
        self.proc.wait()

class CommandSequence( Command ):
    def __init__( self, *steps ):
        self.steps = steps
    def execute( self ):
        for s in self.steps:
            s.execute()

这将允许您构建一系列命令.

That will allow you to build a sequence of commands.

在 Python 中按顺序执行命令?

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