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      client_msg = paramiko.Transport((rechner, 22))
      client_msg.connect(username=login.name, password=login.passwort)
    
      sftp = paramiko.SFTPClient.from_transport(client_msg)
    
      my_file = sftp.open(datei, 'r')
      text = my_file.readlines()
      
      tkMessageBox.showinfo(self.name, text[-5:])
      
      my_file.close()
    
      client_msg.close()

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def tail_file(file, n):
    fsize = os.path.getsize(file)
    buffersize = min(fsize, 4096)
    with open(file, 'rb') as fd:
        buffer = bytearray(buffersize)
        fd.seek(-buffersize, 2)
        amount = 0
        while amount < buffersize:
            chunk_size = fd.readinto(buffer)
            if not chunk_size:
                break
            amount += chunk_size
    lines = [chunk.decode() for chunk in buffer.splitlines()]
    return lines[len(lines) - n:]

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tail -1 wordlist.txt

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from collections import deque

def tail(path, line_count):
    with open(path) as lines:
        return list(deque(lines, line_count))

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def tail_file(filename, n):
    fsize = os.path.getsize(filename)
    buffersize = min(fsize, 4096)
    with open(filename, 'rb') as fd:
        fd.seek(-buffersize, 2)
        buffer = fd.read()
    lines = buffer.decode().splitlines()
    return lines[-n:]

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import inotify.adapters


def filter_log(logfile, filter_func, encoding='utf-8'):
    last_size = os.path.getsize(logfile)
    notify = inotify.adapters.Inotify()
    notify.add_watch(logfile)
    for ev, ev_type, path, filename in notify.event_gen(yield_nones=False):
        if ev_type == ['IN_MODIFY']:
            with open(logfile, 'rb') as log:
                log.seek(last_size)
                new_data = log.read().decode(encoding)
            last_size = os.path.getsize(logfile)
            if filter_func(new_data):
                 yield new_data

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for data in filter_log('/tmp/test', lambda x: True):
    print(data, end='')

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echo -e "123" >> /tmp/test
echo -e "456" >> /tmp/test
echo -e "789" >> /tmp/test