python pandas dataframe修改已有数据的值

import pandas as pd

datas = [
	[1,2,3],
	[2,3,4],
	[3,4,5]
]
df = pd.DataFrame(datas,index=['a','b','c'],columns=['aa','bb','cc'])

修改单元格的值

这里我修改a行bb列的值为1000

df.loc['a','bb] = 1000

修改一行的值

df.loc['a'] = [1000,2000,3000]