python 解决Windows平台上路径有空格的问题

   port_list=[] 
   with open(httpd_conf, "r") as f:
    file_list = f.readlines()
    regex = ur"^Listen\s*(\S*?:)*(\d+)\s*$"
    pattern_listener = re.compile(regex)
    for item in file_list:
     listener_list = pattern_listener.findall(item)
     if listener_list:
      for port_info in listener_list:
       if port_info:
        port = port_info[1]
        if port and port.strip():
         port_list.append(port.strip()) 

D:\>"D:\Program Files\Apache Software Foundation\Apache2.2\bin\httpd.exe" -v
Server version: Apache/2.2.22 (Win32)
Server built: Jan 28 2012 11:16:39

D:\>"D:\Program Files\Apache Software Foundation\Apache2.2\bin\httpd.exe" "-v"
Server version: Apache/2.2.22 (Win32)
Server built: Jan 28 2012 11:16:39

>>> import os
>>> cmd='"D:\Program Files\Apache Software Foundation\Apache2.2\bin\httpd.exe" -v'
>>> os.popen(cmd).read()　　--这种写法读出来结果为空，是因为\要经过转义，前边加个r就行，cmd与cmd1区别
''
>>> cmd　　　　　　　　　　　　--\b是正则表达式，所以变成了\x08
'"D:\\Program Files\\Apache Software Foundation\\Apache2.2\x08in\\httpd.exe" -v'
>>> cmd1=r'"D:\Program Files\Apache Software Foundation\Apache2.2\bin\httpd.exe" -v'
>>> cmd1
'"D:\\Program Files\\Apache Software Foundation\\Apache2.2\\bin\\httpd.exe" -v'

>>> os.popen(cmd1).read()
'Server version: Apache/2.2.22 (Win32)\nServer built: Jan 28 2012 11:16:39\n'
>>>

>>> cmd1=r'"D:\Program Files\Apache Software Foundation\Apache2.2\bin\httpd.exe" -V|find "Server MPM" '
>>> os.popen(cmd1).read()
''

>>> cmd2=r'"D:\Program Files\Apache Software Foundation\Apache2.2\bin\httpd.exe" -V|find Server MPM '
>>> os.popen(cmd1).read()
''

>>> cmd3=r'"D:\Program Files\Apache Software Foundation\Apache2.2\bin\httpd.exe" "-V|find Server MPM" '
>>> os.popen(cmd1).read()
''

>>> import subprocess
>>> cmd=r'D:\Program Files\Apache Software Foundation\Apache2.2\bin\httpd.exe -V|find "Server MPM"'
>>> cmd
'D:\\Program Files\\Apache Software Foundation\\Apache2.2\\bin\\httpd.exe -V|find "Server MPM"'
>>> ps = subprocess.Popen(cmd)
>>> Server version: Apache/2.2.22 (Win32)
Server built: Jan 28 2012 11:16:39
Server's Module Magic Number: 20051115:30
Server loaded: APR 1.4.5, APR-Util 1.4.1
Compiled using: APR 1.4.5, APR-Util 1.4.1
Architecture: 32-bit
Server MPM:  WinNT
 threaded:  yes (fixed thread count)
 forked:  no

>>> homepath="D:\Program Files\Apache Software Foundation\Apache2.2"
>>> BinPath = os.path.join(homepath, 'bin')
>>> os.chdir(BinPath)
>>> apache_model = os.popen('httpd.exe -V |find "Server MPM"').read()
>>> print apache_model
Server MPM:  WinNT