DataFrame修改某列的值

import pandas as pd

# 创建示例 DataFrame
data = {
    'A': [1, 2, 3],
    'B': ['a', 'b', 'c']
}
df = pd.DataFrame(data)

# 修改列 'A' 的值
new_values = [10, 20, 30]
df['A'] = new_values

print(df)

# 修改某列的值
df.loc[0, 'A'] = 55

print(df)