使用位置在pandas df中设置值

import pandas as pd

df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]})
df.at[0, 'A'] = 10
print(df)

    A  B
0  10  4
1   2  5
2   3  6

import pandas as pd

df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]})
df.iat[0, 1] = 10
print(df)

   A   B
0  1  10
1  2   5
2  3   6

import pandas as pd

df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]})
df.loc[0, 'A'] = 10
print(df)

    A  B
0  10  4
1   2  5
2   3  6

import pandas as pd

df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]})
df.iloc[0, 1] = 10
print(df)

   A   B
0  1  10
1  2   5
2  3   6