Python 中的转义转义序列
我对 python 有点陌生。目标是使用子进程解析和执行 shell 命令。从 shell 检索打印输出。执行错误如下面的示例输出消息所示。下面还显示了示例代码片段
代码片段：
testStr = "cat tst.txt | grep Location | sed -e '/.*Location: //g' "
print "testStr = "+testStr
testStrOut = subprocess.Popen([testStr],shell=True,stdout=subprocess.PIPE).communicate()[0]
输出：
testStr = cat tst.txt | grep Location | sed -e '/.*Location: //g'
cat: tst.txt: No such file or directory
sed: -e expression #1, char 15: unknown command: `/'
是否有解决方法或可以使用的函数？
感谢您的帮助 谢谢
I am kind of new to python. Goal is to execute a shell command using subprocess parse & retrive the printed output from shell. The execution errors out as shown in the sample output msg below. Also shown below is the sample code snippet
Code snippet:
testStr = "cat tst.txt | grep Location | sed -e '/.*Location: //g' "
print "testStr = "+testStr
testStrOut = subprocess.Popen([testStr],shell=True,stdout=subprocess.PIPE).communicate()[0]
Output:
testStr = cat tst.txt | grep Location | sed -e '/.*Location: //g'
cat: tst.txt: No such file or directory
sed: -e expression #1, char 15: unknown command: `/'
Is there a workaround or a function that could be used ?
Appreciate your help
Thanks
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评论（2）
我想你的主要错误与 python 无关。更准确地说，有 3 个：
导入子流程。///g而不是s///g。tst.txt不存在。I suppose your main error is not python related. To be more precise, there are 3 of them:
import subprocess.sed -e 's/.*Location: //g'. You wrote///ginstead ofs///g.tst.txtdoes not exist.您应该直接传递 testStr 作为第一个参数，而不是将其包含在列表中。请参阅 subprocess.Popen，以“在 Unix 上，使用 shell”开头的段落=正确：...”。
You should be passing testStr directly as the first argument, rather than enclosing it in a list. See subprocess.Popen, the paragraph that starts "On Unix, with shell=True: ...".