# pad / ffill → 用之前的数据填充 # backfill / bfill → 用之后的数据填充 s = pd.Series([1,1,1,1,2,2,2,3,4,5,np.nan,np.nan,66,54,np.nan,99]) s.replace(np.nan,'缺失数据',inplace = True) print(s) print('---') # df.replace(to_replace=None, value=...