遍历dataframe并提取特殊字符

import pandas as pd
import re

df = pd.DataFrame({'col1': ['abc', 'def', 'ghi'], 'col2': ['123', '456', '789']})

def extract_special_characters(text):
    pattern = r'[!@#$%^&*(),.?":{}|<>]'
    special_chars = re.findall(pattern, text)
    return special_chars

special_chars_list = []
for column in df.columns:
    for value in df[column]:
        special_chars_list.extend(extract_special_characters(value))

print(special_chars_list)