使用Python和regex解析Windows命令结果

Question

我使用以下代码ping网站以检查连接.如何解析结果以获得"Lost ="以查看丢失了多少？

def pingTest():
    host = "www.wired.com"
    ping = subprocess.Popen(
        ["ping","-n","4",host],
        stdout = subprocess.PIPE,
        stderr = subprocess.PIPE
    )

    out,error = ping.communicate()
    print out

这是我从中获得的回报

Pinging wired.com [173.223.232.42] with 32 bytes of data:
Reply from 173.223.232.42: bytes=32 time=54ms TTL=51
Reply from 173.223.232.42: bytes=32 time=54ms TTL=51
Reply from 173.223.232.42: bytes=32 time=54ms TTL=51
Reply from 173.223.232.42: bytes=32 time=54ms TTL=51

Ping statistics for 173.223.232.42:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 54ms, Maximum = 54ms, Average = 54ms

Answer 1

第1步:构造一个匹配的正则表达式Lost = 0 (0% loss),使用\d标签替换数值,这些数值会有所不同.使用捕获组来保留这些值.

第2步:使用re.search扫描out字符串.

第3步:从re的捕获组中提取值.