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def frame_read(fd,head,tail,timeout):
    'return -- donot recv data return None,recv data but wrong format return [],else return data in tupe format, \
            frame_len -- each frame cmd len,'
    if fd is None or len <= 0:
        print 'fd is None or len <= 0,'
        return None
    fd_type = check_obj_type(fd)
#    print 'connect obj type is %s' % fd_type
    if fd_type == 'invalid_type':
        return None
    cur_time = time.time()
    data = ''
    lines = []
    received = False
    head_found = False
    head_len = len(head)
    tail_len = len(tail)
    temp = None
    frame_len = 512
    hex_str = ''
    while 1:
        if is_timeout(cur_time,timeout):
            print 'wait data timeout.'
            if not received:
                return None
            else:               
      


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Á½Õß¾ùÐè import os
(1) os.system
# ½ö½öÔÚÒ»¸ö×ÓÖÕ¶ËÔËÐÐϵͳÃüÁ¶ø²»ÄÜ»ñÈ¡ÃüÁîÖ´ÐкóµÄ·µ»ØÐÅÏ¢
system(command) -> exit_status   
Execute the command (a string) in a subshell. 
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>>> os. ......

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'''
Created on 2009-9-2
@author: jiangqh
'''
# file create and write
context = '''hello world
hello china '''
f = file("hello.txt",'w')
f.write(context)
f.close()
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f = o ......

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#==================================================
import wx
import wx.media

class MyFrame(wx.Frame):
def __init__(self,parent,title):
wx.Frame.__init__(self,parent,-1,title,pos=(150,150),size&;nbsp;=(640, 480),style=wx.MAXIMIZE_BOX|wx.SYSTEM_MENU|wx.CAPTION|wx.CLOSE_BOX| ......
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