摘要：
import pandas as pd data = {"number":[1,1,np.nan,np.nan,2,2,1,2,2], "letter":['a','b',np.nan,np.nan,'c','d','b','c','d'], "label":[1,1,9,9,2,2,1,2,2], 阅读全文
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摘要：
import pandas as pd data = {"number":[1,1,np.nan,np.nan,2,2,1,2,2], "letter":['a','b',np.nan,np.nan,'c','d','b','c','d'], "label":[1,1,9,9,2,2,1,2,2], 阅读全文
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