软件构造，生成算式采用CSV、XML、JSON三种形式进行存储并读取。

编写代码完成将生成的算式及习题长期保存下来，采用CSV、XML、JSON三种形式进行存储并读取。提交相关代码及运行截图。

import random
import csv
import json
import xml.etree.ElementTree as ET
from xml.dom import minidom# 生成随机算式数据
def generate_exercises(count=10):exercises = []operators = ['+', '-', '*', '/']for _ in range(count):num1 = random.randint(1, 10)num2 = random.randint(1, 10)operator = random.choice(operators)# 确保不会出现除以零的情况if operator == '/' and num2 == 0:num2 = 1expression = f"{num1} {operator} {num2}"result = eval(expression)  # 使用eval计算表达式的结果exercises.append({"expression": expression, "result": result})return exercises# CSV 存储与读取
def save_to_csv(data, filename):with open(filename, 'w', newline='') as file:writer = csv.writer(file)writer.writerow(['Expression', 'Result'])for item in data:writer.writerow([item['expression'], item['result']])def load_from_csv(filename):with open(filename, 'r') as file:reader = csv.DictReader(file)return [row for row in reader]# JSON 存储与读取
def save_to_json(data, filename):with open(filename, 'w') as file:json.dump(data, file, indent=4)def load_from_json(filename):with open(filename, 'r') as file:return json.load(file)# XML 存储与读取
def save_to_xml(data, filename):root = ET.Element("Exercises")for item in data:exercise = ET.SubElement(root, "Exercise")ET.SubElement(exercise, "Expression").text = str(item['expression'])ET.SubElement(exercise, "Result").text = str(item['result'])tree = ET.ElementTree(root)xmlstr = minidom.parseString(ET.tostring(root)).toprettyxml(indent="   ")with open(filename, 'w') as f:f.write(xmlstr)def load_from_xml(filename):tree = ET.parse(filename)root = tree.getroot()exercises = []for exercise in root.findall('Exercise'):expression = exercise.find('Expression').textresult = float(exercise.find('Result').text)  # 假设结果都是数字exercises.append({"expression": expression, "result": result})return exercises# 主程序
def main():print("请选择操作：")print("1. 生成新的算式并保存")print("2. 从文件加载算式")choice = input("请输入选项 (1 或 2): ")if choice == '1':count = int(input("请输入要生成的算式数量: "))exercises = generate_exercises(count)format_choice = input("请选择保存格式 (csv, json, xml): ").strip().lower()if format_choice == 'csv':save_to_csv(exercises, 'exercises.csv')print("算式已保存到 exercises.csv 文件中.")elif format_choice == 'json':save_to_json(exercises, 'exercises.json')print("算式已保存到 exercises.json 文件中.")elif format_choice == 'xml':save_to_xml(exercises, 'exercises.xml')print("算式已保存到 exercises.xml 文件中.")else:print("未知的文件格式，请输入 csv, json 或 xml.")elif choice == '2':format_choice = input("请选择加载的文件格式 (csv, json, xml): ").strip().lower()if format_choice == 'csv':loaded_data = load_from_csv('exercises.csv')elif format_choice == 'json':loaded_data = load_from_json('exercises.json')elif format_choice == 'xml':loaded_data = load_from_xml('exercises.xml')else:print("未知的文件格式，请输入 csv, json 或 xml.")returnprint(f"从 {format_choice} 文件加载的数据:")print(loaded_data)else:print("无效的选择，请输入 1 或 2.")if __name__ == "__main__":main()