python删除id相同的行

有个文件的结构如下
The Cunctator 334555717

64.38.175.xxx 334555718

The Cunctator 334555718

The Cunctator 334555720

The Cunctator 334555721

AxelBoldt 334555723

The Cunctator 334555723

对于相同的id而言，我只需要保存最后一个id的数据，请问该怎么用python处理。比如上面的结果应该为：
The Cunctator 334555717

The Cunctator 334555718

The Cunctator 334555720

The Cunctator 334555721

The Cunctator 334555723

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循环，id作为字典的key，遍历

---

with open('input', 'r') as f:
    lines = reversed(filter(bool, f.readlines()))

s = set()
result = []
for line in lines:
    id = line.split()[-1]
    if id in s: continue
    result.append(line)
    s.add(id)
result.reverse()

手机码字未测试