python获取PING结果

      项目需要，写下这段脚本

      通过subprocess.Popen调用系统的ping.exe，获得ping结果文本，再通过正则表达式从结果文本中提取需要的参数。需要考虑中文和英文两种返回结果。

      通过这个简单的程序，静下心来学习了Python的正则表达式，了解了re.match, re.search, re.findall之间的不同。以前总是懵懵懂懂一知半解地乱用，觉得自己还是太浮躁了。

     戒骄戒躁！！！

def getPING(domain):
    ''' 调用系统自带的ping.exe实现PING domain，返回值为：ip,丢包率,最短，最长，平均'''
    p = subprocess.Popen(["ping.exe", domain], stdin = subprocess.PIPE, stdout = subprocess.PIPE, stderr = subprocess.PIPE, shell = True)
    out = p.stdout.read().decode('gbk')
    regIP = r'\[\d+\.\d+\.\d+\.\d+\]'               ## Pinging www.a.shifen.com [115.239.211.112] with 32 bytes of data
    regLost = r'\(\d+%'                             ## Packets: Sent = 4, Received = 4, Lost = 0 (0% loss)   数据包: 已发送 = 4，已接收 = 4，丢失 = 0 (0% 丢失)，
    regMinimum = u'Minimum = \d+ms|最短 = \d+ms'     ## Minimum = 37ms, Maximum = 38ms, Average = 37ms   最短 = 37ms，最长 = 77ms，平均 = 48ms
    regMaximum = u'Maximum = \d+ms|最长 = \d+ms'
    regAverage = u'Average = \d+ms|平均 = \d+ms'
    ip = re.search(regIP, out)
    lost = re.search(regLost, out)
    minimum = re.search(regMinimum, out)
    maximum = re.search(regMaximum, out)
    average = re.search(regAverage, out)
    if ip:
        ip = ip.group()[1:-1]
    if lost:
        lost = lost.group()[1:]
    if minimum:
        minimum = filter(lambda x:x.isdigit(),minimum.group())
    if maximum:
        maximum = filter(lambda x:x.isdigit(),maximum.group())
    if average:
        average = filter(lambda x:x.isdigit(),average.group())
    return (ip,lost,minimum,maximum,average)