subprocess.Popen怎么才能迅速显示命令输出的信息

subprocess.Popen如何才能迅速显示命令输出的信息

Python code

#

import subprocess

class NetDetect:
    
    def __init__(self, addr):
        self.addr = addr
        self.log = open( 'NetDetect.log', 'w' )
        if self.log == None:
            print 'Open NetDetect.log failed'
        
    def __del__(self):
        if self.fdp:
            self.fdp.kill()
        if self.log:
            self.log.close()
        
    def ping(self):
        self.fdp = subprocess.Popen( [ 'ping', self.addr, '-t' ], stdout = subprocess.PIPE )
        for line in self.fdp.stdout:
            print line,
            self.log.write( line )
        self.fdp = None



if __name__ == '__main__' :
    
    nd = NetDetect( 'www.sina.com.cn' )
    nd.ping()

ping命令的结果总是需要等待很长时间才能显示出来，如何才能迅速显示呢？

------解决方案--------------------
上述代码稍微修改下，在XP系统下， python 3.2.2 版本下运行正常，代码如下所示：

Python code


import subprocess

class NetDetect:
    
    def __init__(self, addr):
        self.addr = addr
        self.log = open( 'NetDetect.log', 'w' )
        if self.log == None:
            print('Open NetDetect.log failed')
        
    def __del__(self):
        if self.fdp:
            self.fdp.kill()
        if self.log:
            self.log.close()
        
    def ping(self):
        self.fdp = subprocess.Popen( [ 'ping', self.addr, '-t' ], stdout = subprocess.PIPE )
        for line in self.fdp.stdout:
            print(line.decode("gb2312"))
            self.log.write(line.decode("gb2312"))
            self.log.flush()
        self.fdp = None



if __name__ == '__main__' :
    
    nd = NetDetect( 'www.sina.com.cn' )
    nd.ping()

------解决方案--------------------
嗯，3版的可以跑，还用2版嘛就试试下面dev版本...
http://code.google.com/p/subprocdev/source/browse/subprocess.py?name=default

------解决方案--------------------

探讨

上述代码稍微修改下，在XP系统下， python 3.2.2 版本下运行正常，代码如下所示：
Python code

import subprocess

class NetDetect:

def __init__(self, addr):
self.addr = addr
self.log = open( 'NetDetect.log',……

subprocess.Popen怎么才能迅速显示命令输出的信息

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