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python flask框架学习(三)——豆瓣微信小程序案例

一、templates的使用

(1)在templates里创建一个index.html

(2)再在app.py里写

(3)展示效果

二、构建第一个电影评分

(1)准备好素材放进static里的images里

一、templates的使用

(1)在templates里创建一个index.html

(2)再在app.py里写

from flask import Flask, render_template

app = Flask(__name__)
app.config['TEMPLATES_AUTO_RELOAD'] = True



@app.route('/')
def hello_world():
    return render_template('index.html')

@app.route('/cjs/')
def hello_to_cjs():
    return '欢迎访问蔡军帅的网站！'

if __name__ == '__main__':
    app.run()

(3)展示效果

二、构建第一个电影评分

(1)准备好素材放进static里的images里

(2)写html和css

评分星星的算法

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>豆瓣微信小程序</title>
    <style>
        /*清理网页内部自己的css*/
        *{
            margin: 0;
            padding: 0;
            list-style: none;
            text-decoration: none;
        }
        .container{
             375px;
            height: 600px;
            background: white;
        }

        .search-group{
            padding: 14px 8px;
            background: #41be57;
        }
        .search-group .search-input{
            background: #fff;
            display: block;
             100%;
            height:30px;
            border-radius: 5px;
            outline: none;
            border: none;
        }

        .item-list-group .item-list-top{
            overflow: hidden;
            padding: 10px;
        }
        .item-list-group .module-title{
            float: left;
        }
        .item-list-group .more-btn{
            float: right;
        }

        .list-group{
            /*清除浮动*/
            overflow: hidden;
            padding: 10px;
        }
        .list-group .item-group{
            float: left;
            margin-right: 10px;
        }
        .item-group .thumbnail{
            display: block;
             100px;
        }
        .item-group .item-title{
            font-size: 12px;
            text-align: center;
        }
        .item-group .item-rating{
            font-size: 12px;
            text-align: center;
        }
        .item-rating img{
             10px;
            height: 10px;
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="search-group">
            <input type="text" class="search-input" placeholder="搜索...">
        </div>

        <div class="item-list-group">
            <div class="item-list-top">
                <span class="module-title">电影</span>
                <a href="#" class="more-btn">更多</a>
            </div>
            <div class="list-group">
                <div class="item-group">
                    <img src="https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2572166063.webp" alt="" class="thumbnail">
                    <p class="item-title">少年的你</p>
                    <p class="item-rating">
                        {% set rating = 8.4 %}
                        {% set lights = ((rating|int)/2)|int %}
                        {% set halfs = (rating|int)%2 %}
                        <!--输出{{ halfs }}-->
                        {% set grays = 5-lights-halfs %}
                        {% for light in range(0,lights) %}
                            <img src="{{ url_for("static",filename="images/rate_light.png") }}" alt="">
                        {% endfor %}
                        {% for half in range(0,halfs) %}
                            <img src="{{ url_for("static",filename="images/rate_half.png") }}" alt="">
                        {% endfor %}
                        {% for gray in range(0,grays) %}
                            <img src="{{ url_for("static",filename="images/rate_gray.png") }}" alt="">
                        {% endfor %}
                        {{ rating }}
                    </p>
                </div>
            </div>
        </div>
    </div>
</body>
</html>

三、使用宏构建更多电影评分

1.在html写个宏

    <!--写个宏-->
    {% macro itemGroup(thumbnail,title,rating) %}
        <div class="item-group">
                    <img src="{{ thumbnail }}" alt="" class="thumbnail">
                    <p class="item-title">{{ title }}</p>
                    <p class="item-rating">
                        {% set lights = ((rating|int)/2)|int %}
                        {% set halfs = (rating|int)%2 %}
                        <!--输出{{ halfs }}-->
                        {% set grays = 5-lights-halfs %}
                        {% for light in range(0,lights) %}
                            <img src="{{ url_for("static",filename="images/rate_light.png") }}" alt="">
                        {% endfor %}
                        {% for half in range(0,halfs) %}
                            <img src="{{ url_for("static",filename="images/rate_half.png") }}" alt="">
                        {% endfor %}
                        {% for gray in range(0,grays) %}
                            <img src="{{ url_for("static",filename="images/rate_gray.png") }}" alt="">
                        {% endfor %}
                        {{ rating }}
                    </p>
                </div>
    {% endmacro %}

2.主内容部分就可以简写

            <div class="list-group">
                {{ itemGroup("https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2572166063.webp",'少年的你',8.4) }}
                {{ itemGroup("https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2567998580.webp",'我和我的祖国 ',8.0) }}
                {{ itemGroup("https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2573582192.webp",'决战中途岛',7.7) }}
            </div>

四、将数据从后台传递到前台

1.在后台将数据写入

movies = [
    {
        'id': '11211',
        'thumbnail': 'https://img1.doubanio.com/view/photo/s_ratio_poster/public/p2570059839.webp',
        'title': u'天气之子',
        'rating': u'7.1',
        'comment_count': 12000,
        'authors': u'新海诚'
    },
    {
        'id': '33211',
        'thumbnail': 'https://img1.doubanio.com/view/photo/s_ratio_poster/public/p2570972919.webp',
        'title': u'他们已不再变老',
        'rating': u'8.8',
        'comment_count': 11068,
        'authors': u'彼得·杰克逊'
    },
    {
        'id': '11561',
        'thumbnail': 'https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2568577681.webp',
        'title': u'攀登者',
        'rating': u'6.3',
        'comment_count': 14791,
        'authors': u'李仁港'
    },
    {
        'id': '11891',
        'thumbnail': 'https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2573582192.webp',
        'title': u'决战中途岛',
        'rating': u'7.7',
        'comment_count': 36410,
        'authors': u'罗兰·艾默里奇'
    },
    {
        'id': '11874',
        'thumbnail': 'https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2572166063.webp',
        'title': u'少年的你',
        'rating': u'8.4',
        'comment_count': 50979,
        'authors': u'曾国祥'
    },
    {
        'id': '47112',
        'thumbnail': 'https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2572429001.webp',
        'title': u'受益人',
        'rating': u'6.7',
        'comment_count': 23514,
        'authors': u'申奥'
    }
]

2.前端就可以直接使用数据

五、继续使用宏构建电视剧评分模块

1.后台构造数据传前端

from flask import Flask, render_template

app = Flask(__name__)
app.config['TEMPLATES_AUTO_RELOAD'] = True

movies = [
    {
        'id': '11211',
        'thumbnail': 'https://img1.doubanio.com/view/photo/s_ratio_poster/public/p2570059839.webp',
        'title': u'天气之子',
        'rating': u'7.1',
        'comment_count': 12000,
        'authors': u'新海诚'
    },
    {
        'id': '33211',
        'thumbnail': 'https://img1.doubanio.com/view/photo/s_ratio_poster/public/p2570972919.webp',
        'title': u'他们已不再变老',
        'rating': u'8.8',
        'comment_count': 11068,
        'authors': u'彼得·杰克逊'
    },
    {
        'id': '11561',
        'thumbnail': 'https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2568577681.webp',
        'title': u'攀登者',
        'rating': u'6.3',
        'comment_count': 14791,
        'authors': u'李仁港'
    },
    {
        'id': '11891',
        'thumbnail': 'https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2573582192.webp',
        'title': u'决战中途岛',
        'rating': u'7.7',
        'comment_count': 36410,
        'authors': u'罗兰·艾默里奇'
    },
    {
        'id': '11874',
        'thumbnail': 'https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2572166063.webp',
        'title': u'少年的你',
        'rating': u'8.4',
        'comment_count': 50979,
        'authors': u'曾国祥'
    },
    {
        'id': '47112',
        'thumbnail': 'https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2572429001.webp',
        'title': u'受益人',
        'rating': u'6.7',
        'comment_count': 23514,
        'authors': u'申奥'
    }
]
tvs = [
        {
            'id': '91891',
            'thumbnail': 'https://img9.doubanio.com/view/photo/s_ratio_poster/public/p2564153546.webp',
            'title': u'摩登情爱 第一季',
            'rating': u'8.7',
            'comment_count': 42220,
            'authors': u'约翰·卡尼'
        },
        {
            'id': '91874',
            'thumbnail': 'https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2562953341.jpg',
            'title': u'长安十二时辰',
            'rating': u'8.3',
            'comment_count': 30362,
            'authors': u'曹盾'
        },
        {
            'id': '97112',
            'thumbnail': 'https://img3.doubanio.com/view/photo/s_ratio_poster/public/p2571299085.jpg',
            'title': u'战火浮生 第一季',
            'rating': u'7.6',
            'comment_count': 18374,
            'authors': u'亚当·史密斯'
        }
]

@app.route('/')
def hello_world():
    context = {
        'movies': movies,
        'tvs': tvs
    }
    return render_template('index.html', **context)

@app.route('/cjs/')
def hello_to_cjs():
    return '欢迎访问蔡军帅的网站！'

if __name__ == '__main__':
    app.run()

2.前端再设定宏

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>豆瓣微信小程序</title>
    <style>
        /*清理网页内部自己的css*/
        *{
            margin: 0;
            padding: 0;
            list-style: none;
            text-decoration: none;
        }
        .container{
             375px;
            height: 600px;
            background: white;
        }

        .search-group{
            padding: 14px 8px;
            background: #41be57;
        }
        .search-group .search-input{
            background: #fff;
            display: block;
             100%;
            height:30px;
            border-radius: 5px;
            outline: none;
            border: none;
        }

        .item-list-group .item-list-top{
            overflow: hidden;
            padding: 10px;
        }
        .item-list-group .module-title{
            float: left;
        }
        .item-list-group .more-btn{
            float: right;
        }

        .list-group{
            /*清除浮动*/
            overflow: hidden;
            padding: 10px;
        }
        .list-group .item-group{
            float: left;
            margin-right: 10px;
        }
        .item-group .thumbnail{
            display: block;
             100px;
        }
        .item-group .item-title{
            font-size: 12px;
            text-align: center;
        }
        .item-group .item-rating{
            font-size: 12px;
            text-align: center;
        }
        .item-rating img{
             10px;
            height: 10px;
        }

        .item-group .thumbnail{
             100px;
            height: 140px;
        }
    </style>
</head>
<body>
    <!--写个宏-->
    {% macro itemGroup(thumbnail,title,rating) %}
        <div class="item-group">
                    <img src="{{ thumbnail }}" alt="" class="thumbnail">
                    <p class="item-title">{{ title }}</p>
                    <p class="item-rating">
                        {% set lights = ((rating|int)/2)|int %}
                        {% set halfs = (rating|int)%2 %}
                        <!--输出{{ halfs }}-->
                        {% set grays = 5-lights-halfs %}
                        {% for light in range(0,lights) %}
                            <img src="{{ url_for("static",filename="images/rate_light.png") }}" alt="">
                        {% endfor %}
                        {% for half in range(0,halfs) %}
                            <img src="{{ url_for("static",filename="images/rate_half.png") }}" alt="">
                        {% endfor %}
                        {% for gray in range(0,grays) %}
                            <img src="{{ url_for("static",filename="images/rate_gray.png") }}" alt="">
                        {% endfor %}
                        {{ rating }}
                    </p>
                </div>
    {% endmacro %}

    {% macro listGroup(module_title,items) %}
        <div class="item-list-group">
            <div class="item-list-top">
                <span class="module-title">{{ module_title }}</span>
                <a href="#" class="more-btn">更多</a>
            </div>
            <div class="list-group">
                {% for item in items[0:3] %}
                    {{ itemGroup(item.thumbnail, item.title, item.rating) }}
                {% endfor %}
            </div>
        </div>
    {% endmacro %}

    <div class="container">
        <div class="search-group">
            <input type="text" class="search-input" placeholder="搜索...">
        </div>

        {{ listGroup('电影', movies) }}
        {{ listGroup('电视剧', tvs) }}

    </div>
</body>
</html>

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原文地址：https://www.cnblogs.com/caiyishuai/p/13270604.html