import sys  
import os  
def file_read_from_tail(fname,lines):  
        bufsize = 8192  
        fsize = os.stat(fname).st_size  
        iter = 0  
        with open(fname) as f:  
                if bufsize > fsize:  
                        bufsize = fsize-1  
                        data = []  
                        while True:  
                                iter +=1  
                                f.seek(fsize-bufsize*iter)  
                                data.extend(f.readlines())  
                                if len(data) >= lines or f.tell() == 0:  
                                        print(''.join(data[-lines:]))  
                                        break  
  
file_read_from_tail('test.txt',2)