插一行再插两行，一共几行

先插一行，再一次插两行。输出三个数：第一次改了几行、第二次改了几行、现在表里一共几行（用 / 隔开）。

import sqlite3
db = sqlite3.connect(":memory:")
db.execute("""CREATE TABLE goods (
    id    INTEGER PRIMARY KEY,
    name  TEXT NOT NULL UNIQUE,
    cat   TEXT NOT NULL,
    price INTEGER NOT NULL,
    stock INTEGER)""")
db.executemany("INSERT INTO goods VALUES (?,?,?,?,?)", [
    (1, "绿茶", "饮料", 6, 12),   (2, "红茶", "饮料", 6, 0),
    (3, "苏打水", "饮料", 5, None), (4, "薯片", "零食", 8, 7),
    (5, "海苔", "零食", 12, 3),   (6, "巧克力", "零食", 15, None),
    (7, "铅笔", "文具", 2, 40),   (8, "笔记本", "文具", 9, 5),
    (9, "橡皮", "文具", 3, 0),    (10, "冰红茶", "饮料", 4, 20)])
a = db.execute("INSERT INTO goods VALUES (11,'话梅','零食',7,4)")
b = db.executemany("INSERT INTO goods VALUES (?,?,?,?,?)",
                   [(12, "果冻", "零食", 3, 9), (13, "橙汁", "饮料", 7, 6)])
n = db.execute("SELECT COUNT(*) FROM goods").fetchone()[0]
print(str(a.rowcount) + "/" + str(b.rowcount) + "/" + str(n))