如何仅在csv文件中的特定单词中找到字符时才替换该字符

import csv

def replace_char_in_csv(csv_file, word, char_to_replace, replacement_char):
    # 读取csv文件
    with open(csv_file, 'r') as file:
        reader = csv.reader(file)
        data = list(reader)

    # 遍历数据
    for row in data:
        for i, cell in enumerate(row):
            # 检查特定单词
            if word in cell:
                # 查找和替换字符
                row[i] = cell.replace(char_to_replace, replacement_char)

    # 保存文件
    with open('updated_' + csv_file, 'w', newline='') as file:
        writer = csv.writer(file)
        writer.writerows(data)

# 示例调用
replace_char_in_csv('data.csv', 'specific', 'a', 'b')