如何从csv文件中删除所有的点？

import csv

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

    # 删除所有的点
    for row in data:
        for i in range(len(row)):
            if row[i] == '.':
                row[i] = ''

    # 重新写入csv文件
    with open(csv_file, 'w', newline='') as file:
        writer = csv.writer(file)
        writer.writerows(data)

# 调用函数，传入csv文件路径
remove_dots_from_csv('example.csv')