如何在所有数据框行中搜索定义的数字范围之外的值？

import pandas as pd

def search_outside_range(df, column_range):
    outside_range_rows = []
    for index, row in df.iterrows():
        for column in df.columns:
            value = row[column]
            if not (column_range[0] <= value <= column_range[1]):
                outside_range_rows.append(index)
                break
    return df.loc[outside_range_rows]

# 示例数据框
data = {'A': [1, 2, 3, 4, 5],
        'B': [6, 7, 8, 9, 10],
        'C': [11, 12, 13, 14, 15]}
df = pd.DataFrame(data)

# 定义数字范围
range_min = 2
range_max = 8
column_range = (range_min, range_max)

# 搜索定义范围之外的值
result = search_outside_range(df, column_range)
print(result)