7

我正在使用subprocess.Popenwith Python,我还没有遇到一个优雅的解决方案来&&通过Popen.

我可以这样做:

p1 = subprocess.Popen(["mmls", "WinXP.E01"], stdout=subprocess.PIPE)
result = p1.communicate()[0].split("\n")
for line in result:
    script_log.write(line)

script_log.write("\n")

p1 = subprocess.Popen(["stat", "WinXP.E01"], stdout=subprocess.PIPE)
result = p1.communicate()[0].split("\n")
for line in result:
    script_log.write(line)

但这真的不是很美观(特别是如果我通过Popen.


我想在尽可能少的命令块中复制这个输出。

not@work ~/ESI/lab3/images $ mmls WinXP.E01 && echo -e "\n" && stat WinXP.E01
DOS Partition Table
Offset Sector: 0
Units are in 512-byte sectors

     Slot    Start        End          Length       Description
00:  Meta    0000000000   0000000000   0000000001   Primary Table (#0)
01:  -----   0000000000   0000000062   0000000063   Unallocated
02:  00:00   0000000063   0020948759   0020948697   NTFS (0x07)
03:  -----   0020948760   0020971519   0000022760   Unallocated


  File: `WinXP.E01'
  Size: 4665518381  Blocks: 9112368    IO Block: 4096   regular file
Device: 14h/20d Inode: 4195953     Links: 1
Access: (0644/-rw-r--r--)  Uid: ( 1000/    nott)   Gid: ( 1000/    nott)
Access: 2013-03-16 23:20:41.901326579 -0400
Modify: 2013-03-04 10:05:50.000000000 -0500
Change: 2013-03-13 00:25:33.254684050 -0400
 Birth: -

有什么建议么?

注意:我想避免将其输入subprocess.Popen

p1 = subprocess.Popen(["mmls WinXP.E01 && echo -e '\n' && stat WinXP.E01"], stdout=subprocess.PIPE)
4

2 回答 2

7

&& 是一个 shell 操作符,POpen 默认不使用 shell。

如果您想使用 shell 功能,请在您的 POpen 调用中使用 shell=True,但请注意它会稍微慢一些/占用更多内存。

p1 = subprocess.Popen(["mmls", "WinXP.E01", "&&", "echo", "-e", "\"\n\"", "&&", "stat", "WinXP.E01"],
                      stdout=subprocess.PIPE, shell=True)
于 2013-03-18T01:19:25.543 回答
2

这个怎么样:

from subprocess import Popen, PIPE

def log_command_outputs(commands):
    processes = [Popen(cmd, stdout=PIPE) for cmd in commands]
    outputs = [proc.communicate()[0].split() for proc in processes]
    for output in outputs:
        for line in output:
            script_log.write(line)
        script_long.write("\n")

这会并行启动命令,这可能比一个一个地执行命令要快一点(但可能不会很大)。由于communicate调用是顺序的,任何具有大输出(超过管道缓冲区)的命令都会阻塞,直到轮到它被清理为止。

对于您的示例命令链,您可以调用:

log_command_outputs([["mmls", "WinXP.E01"], ["stat", "WinXP.E01"]])
于 2013-03-18T02:38:18.000 回答