python 2子进程check_output不返回错误输出

Question

我有这个方法

def do_sh_shell_command(string_command, env_variables=None):
    cmd = shlex.split(string_command)
    try:
       p = subprocess.check_output(string_command, shell=True,
                                   env=env_variables) # shell=True means sh shell used 
    except subprocess.CalledProcessError as e:
        print 'Error running command: ' + '"' + e.cmd + '"' + ' see above shell error'
        print 'Return code: ' + str(e.returncode)
        return e.returncode, e.cmd
    return 0, p

它工作但由于某种原因不返回特定命令的错误输出

def hold_ajf_job(job_order_id):
    #print 'ctmpsm -UPDATEAJF ' + job_order_id + ' HOLD'
    return do_sh_shell_command('ctmpsm -UPDATEAJF ' + job_order_id + ' HOLD')

hold_ajf_job('0e4ba')
do_sh_shell_command('lsl')

输出:

ctmpsm -UPDATEAJF 0e4ba HOLD
Error running command: "ctmpsm -UPDATEAJF 0e4ba HOLD" see above shell error
Return code: 1
/bin/sh: lsl:  not found
Error running command: "lsl" see above shell error
Return code: 127

当我运行命令 ctmpsm -UPDATEAJF 0e4ba HOLD 只是形成普通的 shell 我得到以下错误输出

ctmtest1-tctmsv80 [288] ctmpsm -UPDATEAJF 0e4ba HOLD
Failed to Hold Orderno 0000e4ba. (rc=JOBSTATINCM).

这与我的 python 代码中无用的错误输出不同，我终究无法弄清楚为什么？

更新:

尝试 stderr=subprocess.STDOUT

def do_sh_shell_command(string_command, env_variables=None):
    cmd = shlex.split(string_command)
    try:
       p = subprocess.check_output(string_command, stderr=subprocess.STDOUT, shell=True,
                                   env=env_variables) # shell=True means sh shell used 
    except subprocess.CalledProcessError as e:
        print 'Error running command: ' + '"' + e.cmd + '"' + ' see above shell error'
        print 'Return code: ' + str(e.returncode)
        return e.returncode, e.cmd
    return 0, p

输出:

Error running command: "ctmpsm -UPDATEAJF 0e4ba HOLD" see above shell error
Return code: 1
Error running command: "lsl" see above shell error
Return code: 127

现在错误已经完全消失了？

Answer 1

作为documented ，当 check_output 引发异常时，它将命令的输出放在异常对象的 output 属性中。您可以执行以下操作:

try:
    p = subprocess.check_output(string_command, stderr=subprocess.STDOUT,
                                shell=True, env=env_variables)
except subprocess.CalledProcessError as e:
    print e.output
    print 'Error running command: ' + '"' + e.cmd + '"' + ' see above shell error'
    print 'Return code: ' + str(e.returncode)
    return e.returncode, e.cmd
return 0, p