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在主代碼執行開始之前,我想檢查一個特定的端口是否打開,如果是,那麼關閉端口以便代碼可以「乾淨地」啓動。偵聽給定端口的程序
所以我在網上谷歌和這裏找到代碼: http://www.paulwhippconsulting.com.au/tips/63-finding-and-killing-processes-on-ports
但是從那裏只是粘貼代碼:
import os
import subprocess
import re
ports = ['1234','5678','9101']
popen = subprocess.Popen(['netstat', '-lpn'],
shell=False,
stdout=subprocess.PIPE)
(data, err) = popen.communicate()
pattern = "^tcp.*((?:{0})).* (?P[0-9]*)/.*$"
pattern = pattern.format(')|(?:'.join(ports))
prog = re.compile(pattern) #<---- error line
for line in data.split('\n'):
match = re.match(prog, line)
if match:
pid = match.group('pid')
subprocess.Popen(['kill', '-9', pid])
但它拋出一個錯誤。
raise error, v # invalid expression
sre_constants.error: unknown specifier: ?P[