dict2：

{'一起': 0.20100756305184242,
 '万块': 0.20100756305184242,
 '三人': 0.20100756305184242,
 '下海经商': 0.20100756305184242,
 '东挪西撮': 0.10050378152592121,
 '事对': 0.10050378152592121,
 '以沫': 0.10050378152592121,
 '分开': 0.10050378152592121,
 '前一晚': 0.10050378152592121,
 '县长': 0.10050378152592121,
 '喝酒': 0.10050378152592121,
 '回忆起': 0.10050378152592121,
 '困难': 0.10050378152592121,
 '容易': 0.10050378152592121,
 '对不起': 0.20100756305184242,
 '很大': 0.10050378152592121,
 '时期': 0.10050378152592121,
 '易学习': 0.40201512610368484,
 '有福': 0.10050378152592121,
 '李达康': 0.20100756305184242,
 '沙瑞金': 0.20100756305184242,
 '没想到': 0.10050378152592121,
 '王大路': 0.502518907629606,
 '百姓': 0.10050378152592121,
 '相助': 0.10050378152592121,
 '胸怀': 0.10050378152592121,
 '觉得': 0.20100756305184242,
 '触动': 0.10050378152592121,
 '话别': 0.10050378152592121,
 '赔礼道歉': 0.10050378152592121,
 '赞叹': 0.10050378152592121,
 '这件': 0.10050378152592121,
 '道口县': 0.10050378152592121,
 '金山': 0.10050378152592121,
 '降职': 0.10050378152592121,
 '风生水起': 0.10050378152592121}

for key,value in dict2.items():

if dict2[key]<0.2:

dict2.pop(key)

dict2

---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
<ipython-input-58-d6f876cfc345> in <module>
----> 1 for key,value in dict2.items():
      2     if dict2[key]<0.2:
      3         dict2.pop(key)
      4 dict2

RuntimeError: dictionary changed size during iteration