pandas统计数据项重复值次数和删除
转：
https://blog.csdn.net/qq_35203425/article/details/80830911
Pandas学习笔记之重复数据统计
https://blog.csdn.net/lansecheng/article/details/75085675
Pandas数据基础（索引、排序、连接、去重、分箱、异常处理）
https://blog.csdn.net/niuniuyuh/article/details/77102442
from pandas import DataFrame
df = DataFrame({'key1':['a','a','b','b','a','a','b','b'],
'key2':['one','two','one','two','one','one','two','two'],
'key3':[1,2,3,2,1,1,2,3],
# 'data2':np.random.randn(5)
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