commands
— 用于运行命令的实用程序
¶
Deprecated since version 2.6:
The
commands
module has been removed in Python 3. Use the
subprocess
模块代替。
The
commands
module contains wrapper functions for
os.popen()
which take a system command as a string and return any output generated by the command and, optionally, the exit status.
The
subprocess
module provides more powerful facilities for spawning new processes and retrieving their results. Using the
subprocess
module is preferable to using the
commands
模块。
注意
In Python 3.x,
getstatus()
and two undocumented functions (
mk2arg()
and
mkarg()
) have been removed. Also,
getstatusoutput()
and
getoutput()
have been moved to the
subprocess
模块。
The
commands
模块定义了下列函数：
命令。
getstatusoutput
(
cmd
)
¶
执行字符串
cmd
在 Shell 采用
os.popen()
并返回 2 元素元组
(status, output)
.
cmd
is actually run as
{ cmd ; } 2>&1
, so that the returned output will contain output or error messages. A trailing newline is stripped from the output. The exit status for the command can be interpreted according to the rules for the C function
wait()
.
命令。
getoutput
(
cmd
)
¶
像
getstatusoutput()
, except the exit status is ignored and the return value is a string containing the command’s output.
命令。
getstatus
(
file
)
¶
Return the output of
ls -ld file
as a string. This function uses the
getoutput()
function, and properly escapes backslashes and dollar signs in the argument.
Deprecated since version 2.6:
This function is nonobvious and useless. The name is also misleading in the presence of
getstatusoutput()
.
范例：
>>> import commands >>> commands.getstatusoutput('ls /bin/ls') (0, '/bin/ls') >>> commands.getstatusoutput('cat /bin/junk') (256, 'cat: /bin/junk: No such file or directory') >>> commands.getstatusoutput('/bin/junk') (256, 'sh: /bin/junk: not found') >>> commands.getoutput('ls /bin/ls') '/bin/ls' >>> commands.getstatus('/bin/ls') '-rwxr-xr-x 1 root 13352 Oct 14 1994 /bin/ls'
另请参阅
subprocess
Module for spawning and managing subprocesses.