删除DataFrame中值全为NaN或者包含有NaN的列或行方法

   年龄   性别    手机号0  2       男      NaN1  3       女      NaN2  4       NaN    NaN

df.dropna(axis=0,how='all') 

df.dropna(axis=0,how='any') #drop all rows that have any NaN values

df.dropna(axis=1,how='all') 

df.dropna(axis=1,how='any') #drop all rows that have any NaN values