python 如何扩展或实现一个自定义CSV库，以便支持使用多个字符作为字段分隔符进行读取和写入操作？

在Python中，你可以通过创建一个类来扩展csv模块并覆盖其内置的行为。为了实现一个支持多种字符作为字段分隔符的自定义CSV库，你可以这样做：

import csv

class MultiCharDelimitedCSV(csv.reader, csv.writer):
    def __init__(self, *args, delimiter=None, **kwargs):
        self.delimiter = delimiter if delimiter else ','
        super().__init__(*args, **kwargs)

    def read_line(self, row):
        return row.split(self.delimiter)

    def write_row(self, row, field_delimiter=None):
        field_delimiter = field_delimiter or self.delimiter
        return super().writerow([field_delimiter.join(row)])

# 使用示例
with open('file.csv', 'r', newline='', encoding='utf-8') as file:
    reader = MultiCharDelimitedCSV(file)
    for row in reader:
        print(reader.read_line(row))  # 按照自定义分隔符分割每一行

data = ['name|age|city', 'Alice|25|New York', 'Bob|30|London']
with open('file.csv', 'w', newline='', encoding='utf-8') as file:
    writer = MultiCharDelimitedCSV(file, delimiter='|')
    writer.writerows(data)  # 使用自定义分隔符写入数据