求问为什么对DataFrame某列部分值进行赋值没有成功

import numpy as np
import pandas as pd

df = pd.DataFrame(np.random.rand(10, 2), columns=list('ab'))
df['a'] = 1
df['a'].iloc[5:] = 2
df[df['a']==2]['b'] = 10

解决办法在此：https://blog.csdn.net/snail82/article/details/104584145

https://blog.csdn.net/hetongqiyue/article/details/81747552