摘要：
from pandas import DataFrame,Series import pandas as pd import numpy as np data = DataFrame({'k1':['A']*3+['B']*4, 'k2':[1,1,2,3,3,4,4]}) print(data) 阅读全文
摘要：
将 take_last=True 改为 keep='last' 阅读全文
摘要：
from pandas import DataFrame,Series import numpy as np a = Series([np.nan,2.5,np.nan,3.5,4.5,np.nan], index=['f','e','d','c','b','a']) print(a) ''' f 阅读全文
