为满足条件的第一行的dataframe赋值

import pandas as pd

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

condition = df['A'] > 2
first_row = df.loc[condition].iloc[0]

df.loc[0] = first_row

import pandas as pd

# 创建DataFrame
df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]})

# 根据条件选择第一行
condition = df['A'] > 2
first_row = df.loc[condition].iloc[0]

# 对第一行进行赋值
df.loc[0] = first_row

print(df)