如何检查csv文件中是否已存在行？

import csv

def check_existing_row(csv_file, target_row):
    with open(csv_file, 'r') as file:
        reader = csv.reader(file)
        for row in reader:
            if row == target_row:
                return True
    return False

# 示例用法
csv_file = 'data.csv'
target_row = ['John', 'Doe', 'john.doe@example.com']
exists = check_existing_row(csv_file, target_row)
if exists:
    print("Target row already exists in the CSV file.")
else:
    print("Target row does not exist in the CSV file.")