subprocess实时获取结果和捕获错误
需要调用命令行来执行某些命令，主要是用 subprocess 实时获取结果和捕获错误，发现subprocess的很多坑。
subprocess 普通获取结果方式，其需要命令完全执行才能返回结果：
import subprocess
scheduler_order = "df -h"
return_info = subprocess.Popen(scheduler_order, shell=True, stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
for next_line in return_info.stdout:
return_line = next_line.decode("utf-8", "ignore")
print(return_line)客subprocess 实时获取结果：
import subprocess
scheduler_order = "df -h"
return_info = subprocess.Popen(scheduler_order, shell=True, stdout=subprocess.PIPE,stderr=subprocess.STDOUT)
while True:
next_line = return_info.stdout.readline()
return_line = next_line.decode("utf-8", "ignore")
if return_line == '' and return_info.poll() != None:
break
print(return_line)想要获取报错机制，使用 check_output 捕捉报错和使用 check_call 捕捉报错，及时在 Popen 中捕获报错，都会使 实时输出失效 ！，所以自行查看 CalledProcessError 源码终于搞定。
实时发送以及捕获报错：
import subprocess
try:
scheduler_order = "top -u ybtao"
return_info = subprocess.Popen(scheduler_order, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
while True:
next_line = return_info.stdout.readline()
return_line = next_line.decode("utf-8", "ignore")
if return_line == '' and return_info.poll() != None:
break
print(return_line)
returncode = return_info.wait()
if returncode:
raise subprocess.CalledProcessError(returncode, return_info)
except Exception as e:
print(e)本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。
原始发表：2018-11-01 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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