ModuleNotFoundError: No module named 'tagger'

• 测试代码github链接如下
  

• 导包

  from __future__ import print_function
  import os, codecs
  #from itertools import izip
  izip = zip
  from tagger import data_iterator
  

• 编译出错
  ModuleNotFoundError: No module named 'tagger'

• 然后pip install tagger
  出现这个问题：
  Could not find a version that satisfies the requirement rdflib==2.3.1events (from tagger) (from versions: 2.4.1, 2.4.2, 3.0.0, 3.1.0, 3.2.0, 3.2.1, 3.2.2, 3.2.3, 3.4.0, 4.0, 4.0.1, 4.1.0, 4.1.1, 4.1.2, 4.2.0, 4.2.1, 4.2.2)
  No matching distribution found for rdflib==2.3.1events (from tagger)

请问是什么问题