用Python设计一个营销商品信息展示平台

好的，下面是一个简单的用Python实现的营销商品信息展示平台的代码示例：

# 导入必要的库
from flask import Flask, render_template, request, redirect, url_for
import sqlite3

# 创建Flask应用
app = Flask(__name__)

# 配置数据库
app.config['DATABASE'] = 'marketplace.db'

# 建立数据库连接
def get_db():
    db = getattr(app, '_database', None)
    if db is None:
        db = sqlite3.connect(app.config['DATABASE'])
        app._database = db
    return db

# 关闭数据库连接
@app.teardown_appcontext
def close_connection(exception):
    db = getattr(app, '_database', None)
    if db is not None:
        db.close()

# 商品列表页
@app.route('/')
def index():
    db = get_db()
    cursor = db.execute('SELECT * FROM products')
    products = cursor.fetchall()
    return render_template('index.html', products=products)

# 商品详情页
@app.route('/product/<int:id>')
def product_detail(id):
    db = get_db()
    cursor = db.execute('SELECT * FROM products WHERE id = ?', (id,))
    product = cursor.fetchone()
    return render_template('product_detail.html', product=product)

# 购物车页
@app.route('/cart')
def cart():
    cart = request.cookies.get('cart')
    if cart:
        cart_ids = cart.split(',')
        db = get_db()
        cursor = db.execute('SELECT * FROM products WHERE id IN ({0})'
                            .format(','.join(['?']*len(cart_ids))), cart_ids)
        products = cursor.fetchall()
    else:
        products = []
    return render_template('cart.html', products=products)

# 添加商品到购物车
@app.route('/add_to_cart/<int:id>')
def add_to_cart(id):
    cart = request.cookies.get('cart')
    if cart:
        cart_ids = cart.split(',')
        if str(id) not in cart_ids:
            cart_ids.append(str(id))
            response = redirect(url_for('cart'))
            response.set_cookie('cart', ','.join(cart_ids))
        else:
            response = redirect(request.referrer)
    else:
        response = redirect(url_for('cart'))
        response.set_cookie('cart', str(id))
    return response

# 从购物车中删除商品
@app.route('/remove_from_cart/<int:id>')
def remove_from_cart(id):
    cart = request.cookies.get('cart')
    if cart:
        cart_ids = cart.split(',')
        if str(id) in cart_ids:
            cart_ids.remove(str(id))
            response = redirect(url_for('cart'))
            if cart_ids:
                response.set_cookie('cart', ','.join(cart_ids))
            else:
                response.delete_cookie('cart')
        else:
            response = redirect(request.referrer)
    else:
        response = redirect(url_for('cart'))
    return response

# 下单
@app.route('/checkout')
def checkout():
    cart = request.cookies.get('cart')
    if cart:
        cart_ids = cart.split(',')
        db = get_db()
        cursor = db.execute('SELECT * FROM products WHERE id IN ({0})'
                            .format(','.join(['?']*len(cart_ids))), cart_ids)
        products = cursor.fetchall()
        total_price = sum([product[2] for product in products])
        response = render_template('checkout.html', products=products, total_price=total_price)
        response.delete_cookie('cart')
    else:
        response = redirect(url_for('cart'))
    return response

# 运行Flask应用
if __name__ == '__main__':
    app.run(debug=True)

以上代码使用了Flask框架，实现了商品列表页、商品详情页、购物车页、下单等功能。可以根据实际情况进行修改和扩展。需要注意的是，这只是一个简单的示例，实际上要实现一个完整的网上营销商品信息展示平台，还需要考虑很多方面，例如安全性、性能、用户体验等。