如何导入2个CSV文件，如果其中一个文件存在于另一个文件中，如何比较值，并生成最终的CSV，其中有一列表明值是否存在？

import csv

def compare_csv(file1, file2, output_file):
    data1 = read_csv(file1)
    data2 = read_csv(file2)
    
    with open(output_file, 'w', newline='') as csvfile:
        writer = csv.writer(csvfile)
        writer.writerow(['Value', 'Exists'])
        
        for row1 in data1:
            value = row1['Value']
            exists = 'Yes' if find_value(value, data2) else 'No'
            writer.writerow([value, exists])

def read_csv(file):
    data = []
    
    with open(file, 'r') as csvfile:
        reader = csv.DictReader(csvfile)
        for row in reader:
            data.append(row)
    
    return data

def find_value(value, data):
    for row in data:
        if row['Value'] == value:
            return True
    return False

# 使用示例
compare_csv('file1.csv', 'file2.csv', 'output.csv')