题目说明

创建一个简单的个人支出记账系统，帮助自己监控和管理日常开支。拟使用SQLite数据库来存储支出记录，数据库名为expenses.db，并设计一个表expenses来记录每一笔支出，表中包含三个字段：id（整型，主键自增），category（文本类型，表示支出类别），amount（实数类型，表示支出金额）。

请完善以下Python程序来实现个人支出跟踪的基本功能。

（本题无需运行通过，写入代码即可）

import sqlite3
def create_expenses_table():
    connection = sqlite3.connect('expenses.db')
    cursor = connection.cursor()
    cursor.execute('''
        CREATE TABLE IF NOT EXISTS expenses (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            category TEXT,
            amount REAL
        )
    ''')
    connection.commit()
    connection.        ①        ()

def add_expense(category, amount):
    connection = sqlite3.connect('expenses.db')
    cursor = connection.cursor()
    cursor.execute("INSERT INTO expenses (category, amount) VALUES (?, ?)", (        ②        ,         ③        ))
    connection.commit()
    connection.close()

def fetch_all_expenses():
    connection = sqlite3.connect('expenses.db')
    cursor = connection.cursor()
    cursor.execute("SELECT * FROM expenses")
    expenses_records = cursor.        ④        ()
    for record in expenses_records:
        print(record)
    connection.close()

# 调用函数
create_expenses_table()
add_expense("Food", 25.5)
add_expense("Transport", 10.75)
fetch_all_expenses()