readlines()

Yong Wang yong at net.tamu.edu
Wed Aug 18 17:48:24 CEST 2004


Hi,
   I use readlines() to read one data file. Python automatically parses the read contents
into a list of lines. When I used list[0] to print out the 1st line, it is ok. When I use
the list index 2 to print out the 2nd line , there is an error mesage. I only need one line of
input data file in the middle of the file. For example, I have data file like: 
---------------------------------------------------------------------------
          Timestamp: Sat Aug  7 11:14:57 AM
    Adapter Address: 00:60:08:2A:C9:5A
         IP Address: 165.91.10.244
       Directory ID: 0675392c736079cfd81a55028df3cb43
        Domain Name: bdanwood.dsl.tamu.edu
    DHCP/NIM Action: lease renewed
           Comments: 
---------------------------------------------------------------------------
          Timestamp: Sat Aug  7 11:15:56 PM
    Adapter Address: 00:60:08:2A:C9:5A
         IP Address: 165.91.10.244
      Directory ID: 0675392c736079cfd81a55028df3cb43
        Domain Name: bdanwood.dsl.tamu.edu
    DHCP/NIM Action: lease renewed
           Comments: 
---------------------------------------------------------------------------

I have some codes:
    .......
for line in db1:
   (ip, mac) = string.split(line)
    print 'ip is ', ip
    run = 'dhcpacct --ip=%s  > tt1'
    os.system(run)
    getdata = open('tt1', 'r')
    data    = getdata.readlines()
    print 'data[0] is', data[0]
    print 'data[3] is', data[3]
    getdata.close()
 
When run the codes, I got:
data[0] is ---------------------------------------------------------------------------

data[3] is
Traceback (innermost last):
  File "com1", line 64, in ?
    print 'data[3] is', data[3]
IndexError: list index out of range

    How can I fix it ?

    Thanks,





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