如何在csv数据列上使用Python set方法？

import csv

with open('data.csv', 'r') as file:
    csv_reader = csv.reader(file)

header = next(csv_reader)  # 读取表头
column_index = header.index('column_name')  # 获取特定列的索引

column_data = [row[column_index] for row in csv_reader]  # 使用列表解析式读取特定列的数据

column_set = set(column_data)

# 查找特定元素
if 'value' in column_set:
    print('Value found in the set')

# 计算交集
other_set = set(['value1', 'value2', 'value3'])
intersection = column_set.intersection(other_set)
print(intersection)

# 计算并集
union = column_set.union(other_set)
print(union)

# 计算差集
difference = column_set.difference(other_set)
print(difference)