code example for Python to read n rows after a file

This article mainly introduces the Python implementation of the last n read the file of the method, involving Python for file reading, traversal and operation related operations skills, the need for friends can refer to the following

#-*-Coding:utf8-*-import osimport timeimport datetimeimport mathimport stringdef get_last_line (inputfile): FileSize = O S.path.getsize (inputfile) blocksize = 1024x768 Dat_file = open (Inputfile, ' r ') last_line = "" lines = Dat_file.readlines () cou NT = len (lines) if count>60:   num=60 Else:   num=count i=1; lastre = [] for I in range (1, (num+1)):   If lines: C3/>n =-     I last_line = Lines[n].strip ()     #print "last line:", Last_line     dat_file.close ()     #print i     Lastre.append (last_line) return lastre# Gets the result of the last row re = Get_last_line ('.. /update/log/rtime/rtime20130805.log ') print Len (re) for N in Re:  strlist = N.split ("  )  if strlist[1] = = ' Ok ' and String.atoi (Strlist[2]) >1000:     print ' data bar count normal '     print ' OK '  else:     print ' too little data to check email '

The above processing and log file formats are

2013-08-05 16:09:30  OK  16732013-08-05 16:10:34  ok  16282013-08-05 16:11:55  OK  712013-08-05 16:13:02  OK  14412013-08-05 16:14:06  ok  16342013-08-05 16:15:10  OK  17172013-08-05 16:16:14  OK  16872013-08-05 16:17:18  ok  16422013-08-05 16:18:27  OK  16552013-08-05 16:19:33  OK  1655

Read the last line:

#返回文件最后一行函数def Get_last_line (inputfile): FileSize = Os.path.getsize (inputfile) blocksize = 1024x768 Dat_file = open (inputfil E, ' r ') Last_line = "" If FileSize > blocksize:   maxseekpoint = (filesize//BlockSize)   Dat_file.seek ((maxsee kpoint-1) *blocksize) elif filesize:   #maxseekpoint = blocksize% filesize   dat_file.seek (0, 0) lines = dat_file. ReadLines () If lines:   last_line = Lines[-1].strip () #print "last line:", Last_line dat_file.close () return Last_li Ne

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