有时执行dos命令需要保存返回值
需要导入库subprocess
import subprocess
p = subprocess.Popen('ping www.baidu.com', shell=True, stdout=subprocess.PIPE) out, err = p.communicate() print out.splitlines()[24:27] for line in out.splitlines(): print line
splitlines 是个列表
可以切片操作
完整代码:
# 利用python的subprocess模块执行外部命令, 并捕获stdout, stderr的输出: # Python代码 import subprocess # print ’popen3:’ def external_cmd(cmd, msg_in=''): try: proc = subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE, ) stdout_value, stderr_value = proc.communicate(msg_in) return stdout_value, stderr_value except ValueError as err: # log("ValueError: %s" % err) return None, None except IOError as err: # log("IOError: %s" % err) return None, None if __name__ == '__main__': stdout_val, stderr_val = external_cmd('ls -l') print 'Standard Output: %s' % stdout_val print 'Standard Error: %s' % stderr_val
输出:
Standard Output: Standard Error: 'ls' 不是内部或外部命令,也不是可运行的程序 或批处理文件。 Process finished with exit code 0
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