flask

flask基本

一个示例：

#conding:utf8
from flask import Flask

app = Flask('todo-list')
app.debug = True

@app.route('/')
def hello():
    return 'hello, world!'

if __name__ == "__main__":
    app.run(host='0.0.0.0',port=8011)

模板渲染

#conding:utf8
from flask import Flask, render_template

app = Flask('todo-list')
app.debug = True

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

if __name__ == "__main__":
    app.run(host='0.0.0.0',port=8011)
<!DOCTYPE html>
<html>
<head>
	<title></title>
</head>
<body>
	<H1>Welcome,Jim</H1>
	<p>this is my first page</p>
</body>
</html>

变量

URL参数

from flask import Flask
app = Flask(__name__)

@app.route('/user/<name>')
def user(name):
    return '<h1>Hello, {0}!</h1>'.format(name)

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

模板渲染

from flask import Flask, render_template
app = Flask(__name__)


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

模板渲染列表

├── templates
│   └── index.html
└── weather.py


# 模板中元素的渲染列表
from flask import Flask, render_template
app = Flask(__name__)


@app.route('/')
def index():
    months = ['January', 'February', 'March', 'April', 'May', 'June', 'July',
              'August', 'September', 'October', 'November', 'December']
    return render_template('index.html', city='Portland, OR', months=months)
<h1>Weather Averages</h1>
<h2>{{ city }}</h2>
<hr>
<table>
    <tr>
        <th>Month</th>
        <th>Min</th>
        <th>Max</th>
        <th>Rainfall</th>
    </tr>
    {% for month in months %}
    <tr>
        <td>{{ month }}</td>
        <td></td>
        <td></td>
        <td></td>
    </tr>
    {% endfor %}
</table>

渲染数据结构 for

#coding:utf-8

from flask import Flask, render_template
app = Flask(__name__)



@app.route('/')
def index():
	city = u'北京'
	months = ['1', '2', '3', '4','5', '6', '7', '8', '9', '10', '11', '12']
	weather = {
        '1': {'min': 38, 'max': 47, 'rain': 6.14},
        '2': {'min': 38, 'max': 51, 'rain': 4.79},
        '3': {'min': 41, 'max': 56, 'rain': 4.5},
        '4': {'min': 44, 'max': 61, 'rain': 3.4},
        '5': {'min': 49, 'max': 67, 'rain': 2.55},
        '6': {'min': 53, 'max': 73, 'rain': 1.69},
        '7': {'min': 57, 'max': 80, 'rain': 0.59},
        '8': {'min': 58, 'max': 80, 'rain': 0.71},
        '9': {'min': 54, 'max': 75, 'rain': 1.54},
        '10': {'min': 48, 'max': 63, 'rain': 3.42},
        '11': {'min': 41, 'max': 52, 'rain': 6.74},
        '12': {'min': 36, 'max': 45, 'rain': 6.94}
    }
	return render_template('index.html', city=city, months=months,weather=weather)

if __name__ == '__main__':
    app.run(debug=True)
<!DOCTYPE html>
<html>
<head>
	<title>sddsddd</title>
	<meta charset="utf-8">
</head>
<body>
	<h1>天气平均值</h1>
	<h2>{{city}}</h2>
	<table border="1px">
		<tr>
			<th>月份</th>
			<th>最大</th>
			<th>最小</th>
			<th>平均值</th>
		</tr>
		{% for month in months %}
		<tr>
	        <td>{{ month }}</td>
	        <td>{{weather[month]['max']}}</td>
	        <td>{{weather[month]['min']}}</td>
	        <td>{{weather[month]['rain']}}</td>
    	</tr>
		{% endfor%}
	</table>
</body>
</html>

模板中使用条件判断 if

#coding:utf-8

from flask import Flask, render_template
app = Flask(__name__)



@app.route('/')
def index():
	city = u'北京'
	months = ['1', '2', '3', '4','5', '6', '7', '8', '9', '10', '11', '12']
	weather = {
        '1': {'min': 38, 'max': 47, 'rain': 6.14},
        '2': {'min': 38, 'max': 51, 'rain': 4.79},
        '3': {'min': 41, 'max': 56, 'rain': 4.5},
        '4': {'min': 44, 'max': 61, 'rain': 3.4},
        '5': {'min': 49, 'max': 67, 'rain': 2.55},
        '6': {'min': 53, 'max': 73, 'rain': 1.69},
        '7': {'min': 57, 'max': 80, 'rain': 0.59},
        '8': {'min': 58, 'max': 80, 'rain': 0.71},
        '9': {'min': 54, 'max': 75, 'rain': 1.54},
        '10': {'min': 48, 'max': 63, 'rain': 3.42},
        '11': {'min': 41, 'max': 52, 'rain': 6.74},
        '12': {'min': 36, 'max': 45, 'rain': 6.94}
    }
	highlight = {'min': 40, 'max': 80, 'rain': 5}

	return render_template('index.html', city=city, months=months,weather=weather,
		highlight=highlight)

if __name__ == '__main__':
    app.run(debug=True)
<!DOCTYPE html>
<html>
<head>
	<title>sddsddd</title>
	<meta charset="utf-8">
</head>
<body>
	<h1>天气平均值</h1>
	<h2>{{city}}</h2>
	<table border="1px">
		<tr>
			<th>月份</th>
			<th>最大</th>
			<th>最小</th>
			<th>平均值</th>
		</tr>
		{% for month in months %}
		<tr>
	        <td>{{ month }}</td>
	     <td>
	     <!-- 如果 每个月的值满足表达式 小于等于 则对其加粗显示 -->
            {% set hl = weather[month]['min'] <= highlight['min'] %}
            {% if hl %}<b>{% endif %}
            {{ weather[month]['min'] }}
            {% if hl %}</b>{% endif %}
        </td>
        <td>
            {% set hl = weather[month]['max'] >= highlight['max'] %}
            {% if hl %}<b>{% endif %}
            {{ weather[month]['max'] }}
            {% if hl %}</b>{% endif %}
        </td>
        <td>
            {% set hl = weather[month]['rain'] >= highlight['rain'] %}
            {% if hl %}<b>{% endif %}
            {{ weather[month]['rain'] }}
            {% if hl %}</b>{% endif %}
            </td>
    	</tr>
		{% endfor%}
	</table>

</body>
</html>

使用模板宏

相当于py中的函数，函数再调用函数减少代码冗余量

#coding:utf-8

from flask import Flask, render_template
app = Flask(__name__)



@app.route('/')
def index():
	city = u'北京'
	months = ['1', '2', '3', '4','5', '6', '7', '8', '9', '10', '11', '12']
	weather = {
        '1': {'min': 38, 'max': 47, 'rain': 6.14},
        '2': {'min': 38, 'max': 51, 'rain': 4.79},
        '3': {'min': 41, 'max': 56, 'rain': 4.5},
        '4': {'min': 44, 'max': 61, 'rain': 3.4},
        '5': {'min': 49, 'max': 67, 'rain': 2.55},
        '6': {'min': 53, 'max': 73, 'rain': 1.69},
        '7': {'min': 57, 'max': 80, 'rain': 0.59},
        '8': {'min': 58, 'max': 80, 'rain': 0.71},
        '9': {'min': 54, 'max': 75, 'rain': 1.54},
        '10': {'min': 48, 'max': 63, 'rain': 3.42},
        '11': {'min': 41, 'max': 52, 'rain': 6.74},
        '12': {'min': 36, 'max': 45, 'rain': 6.94}
    }
	highlight = {'min': 40, 'max': 80, 'rain': 5}

	return render_template('index.html', city=city, months=months,
		weather=weather,highlight=highlight)

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

index.html

{% import 'macros.html' as macros %}
<!DOCTYPE html>
<html>
<head>
	<title>sddsddd</title>
	<meta charset="utf-8">
</head>
<body>
	<h1>天气平均值</h1>
	<h2>{{city}}</h2>
	<table border="1px">
		<tr>
			<th>月份</th>
			<th>最小</th>
			<th>最大</th>
			<th>降雨量</th>
		</tr>

		{% for month in months %}
			{{ macros.weather_row(month,
							weather[month]['min'],
							weather[month]['max'],
							weather[month]['rain'],
							highlight['min'],
							highlight['max'],
							highlight['rain'] 
							) 
			}}	
		{% endfor%}
	</table>

</body>
</html>

macros.html

<!-- 定义函数 值与变量 当h1满足条件时加粗字体 -->
{% macro weather_cell(value, hl) %}
    <td>
        {% if hl %}<b>{% endif %}
        {{ value }}
        {% if hl %}</b>{% endif %}
    </td>
{% endmacro %}



{% macro weather_row(month, min, max, rain, hl_min, hl_max, hl_rain) %}
    <tr>
        <td>{{ month }}</td>
        {{ weather_cell(min, min <= hl_min) }}
        {{ weather_cell(max, max >= hl_max) }}
        {{ weather_cell(rain, rain >= hl_rain) }}
    </tr>
{% endmacro %}
<!-- 函数调用函数  当min 低于预定值时会加粗显示-->

引用bootstrap到模板

pip install flask-bootstrap
app.py

#coding:utf-8

from flask import Flask, render_template
from flask_bootstrap import Bootstrap
app = Flask(__name__)
bootstrap = Bootstrap(app)


@app.route('/')
def index():
	city = u'北京'
	months = ['1', '2', '3', '4','5', '6', '7', '8', '9', '10', '11', '12']
	weather = {
        '1': {'min': 38, 'max': 47, 'rain': 6.14},
        '2': {'min': 38, 'max': 51, 'rain': 4.79},
        '3': {'min': 41, 'max': 56, 'rain': 4.5},
        '4': {'min': 44, 'max': 61, 'rain': 3.4},
        '5': {'min': 49, 'max': 67, 'rain': 2.55},
        '6': {'min': 53, 'max': 73, 'rain': 1.69},
        '7': {'min': 57, 'max': 80, 'rain': 0.59},
        '8': {'min': 58, 'max': 80, 'rain': 0.71},
        '9': {'min': 54, 'max': 75, 'rain': 1.54},
        '10': {'min': 48, 'max': 63, 'rain': 3.42},
        '11': {'min': 41, 'max': 52, 'rain': 6.74},
        '12': {'min': 36, 'max': 45, 'rain': 6.94}
    }
	highlight = {'min': 40, 'max': 80, 'rain': 5}

	return render_template('index.html', city=city, months=months,
		weather=weather,highlight=highlight)

if __name__ == '__main__':
    app.run(port=1012, debug=True)

{% extends 'bootstrap/base.html' %}
{% import 'macros.html' as macros %}

{% block title %}Weather Averages for {{ city }}{% endblock %}

{% block navbar %}
    <nav class="navbar navbar-inverse" role="navigation">
        <div class="container">
            <a class="navbar-brand" href="#">Weather</a>
        </div>    
    </nav>
{% endblock %}

{% block content %}
    <div class="container">
        <h1>Weather Averages</h1>
        <h2>{{ city }}</h2>
        <table class="table table-hover">
            <tr>
                <th>Month</th>
                <th>Min</th>
                <th>Max</th>
                <th>Rainfall</th>
            </tr>
            {% for month in months %}
                {{ macros.weather_row(month,
                                      weather[month]['min'],
                                      weather[month]['max'], 
                                      weather[month]['rain'],
                                      highlight['min'],
                                      highlight['max'],
                                      highlight['rain']) }}
            {% endfor %}
        </table>
    </div>    
{% endblock %}

macros.html

<!-- 定义函数 值与变量 当h1满足条件时加粗字体 -->
{% macro weather_cell(value, hl) %}
   <td{% if hl %} class="warning"{% endif %}>{{ value }}</td>
{% endmacro %}



{% macro weather_row(month, min, max, rain, hl_min, hl_max, hl_rain) %}
    <tr>
        <td>{{ month }}</td>
        {{ weather_cell(min, min <= hl_min) }}
        {{ weather_cell(max, max >= hl_max) }}
        {{ weather_cell(rain, rain >= hl_rain) }}
    </tr>
{% endmacro %}
<!-- 函数调用函数  当min 低于预定值时会加粗显示-->


{% macro weather_cell(value, hl) %}
    <td{% if hl %} class="warning"{% endif %}>{{ value }}</td>
{% endmacro %}

自定义404页面

#coding:utf-8

from flask import Flask, render_template
from flask_bootstrap import Bootstrap
app = Flask(__name__)
bootstrap = Bootstrap(app)


@app.route('/')
def index():
	city = u'北京'
	months = ['1', '2', '3', '4','5', '6', '7', '8', '9', '10', '11', '12']
	weather = {
        '1': {'min': 38, 'max': 47, 'rain': 6.14},
        '2': {'min': 38, 'max': 51, 'rain': 4.79},
        '3': {'min': 41, 'max': 56, 'rain': 4.5},
        '4': {'min': 44, 'max': 61, 'rain': 3.4},
        '5': {'min': 49, 'max': 67, 'rain': 2.55},
        '6': {'min': 53, 'max': 73, 'rain': 1.69},
        '7': {'min': 57, 'max': 80, 'rain': 0.59},
        '8': {'min': 58, 'max': 80, 'rain': 0.71},
        '9': {'min': 54, 'max': 75, 'rain': 1.54},
        '10': {'min': 48, 'max': 63, 'rain': 3.42},
        '11': {'min': 41, 'max': 52, 'rain': 6.74},
        '12': {'min': 36, 'max': 45, 'rain': 6.94}
    }
	highlight = {'min': 40, 'max': 80, 'rain': 5}

	return render_template('index.html', city=city, months=months,
		weather=weather,highlight=highlight)
'''
404页面
'''
@app.errorhandler(404)
def not_found(e):
    return render_template('404.html')

if __name__ == '__main__':
    app.run(port=1012, debug=True)

base.html

{% extends 'bootstrap/base.html' %}

{% block navbar %}
    <nav class="navbar navbar-inverse" role="navigation">
        <div class="container">
            <a class="navbar-brand" href="#">Weather</a>
        </div>    
    </nav>
{% endblock %}

{%- block metas %}
<meta charset="utf-8">
{%- endblock metas %}

{% block content %}
    <div class="container">
        {% block page_content %}{% endblock %}
    </div>
{% endblock %}

macros.html

{% macro weather_cell(value, hl) %}
    <td{% if hl %} class="warning"{% endif %}>{{ value }}</td>
{% endmacro %}

{% macro weather_row(month, min, max, rain, hl_min, hl_max, hl_rain) %}
    <tr>
        <td>{{ month }}</td>
        {{ weather_cell(min, min <= hl_min) }}
        {{ weather_cell(max, max >= hl_max) }}
        {{ weather_cell(rain, rain >= hl_rain) }}
    </tr>
{% endmacro %}

index.html


{% extends 'base.html' %}
{% import 'macros.html' as macros %}

{% block title %}Weather Averages for {{ city }}{% endblock %}

{% block page_content %}
    <h1>Weather Averages</h1>
    <h2>{{ city }}</h2>
    <table class="table table-hover">
        <tr>
            <th>Month</th>
            <th>Min</th>
            <th>Max</th>
            <th>Rainfall</th>
        </tr>
        {% for month in months %}
            {{ macros.weather_row(month,
                                  weather[month]['min'],
                                  weather[month]['max'], 
                                  weather[month]['rain'],
                                  highlight['min'],
                                  highlight['max'],
                                  highlight['rain']) }}
        {% endfor %}
    </table>
{% endblock %}

404.html

{% extends 'base.html' %}

{% block title %}Not Found{% endblock %}

{% block page_content %}
    <h1>404 页面未找到</h1>
{% endblock %}

url_for() 函数

直接跳转到控制层某函数
app.py

#coding:utf-8

from flask import Flask, render_template
from flask_bootstrap import Bootstrap
app = Flask(__name__)
bootstrap = Bootstrap(app)


@app.route('/')
def index():
	city = u'北京'
	months = ['1', '2', '3', '4','5', '6', '7', '8', '9', '10', '11', '12']
	weather = {
        '1': {'min': 38, 'max': 47, 'rain': 6.14},
        '2': {'min': 38, 'max': 51, 'rain': 4.79},
        '3': {'min': 41, 'max': 56, 'rain': 4.5},
        '4': {'min': 44, 'max': 61, 'rain': 3.4},
        '5': {'min': 49, 'max': 67, 'rain': 2.55},
        '6': {'min': 53, 'max': 73, 'rain': 1.69},
        '7': {'min': 57, 'max': 80, 'rain': 0.59},
        '8': {'min': 58, 'max': 80, 'rain': 0.71},
        '9': {'min': 54, 'max': 75, 'rain': 1.54},
        '10': {'min': 48, 'max': 63, 'rain': 3.42},
        '11': {'min': 41, 'max': 52, 'rain': 6.74},
        '12': {'min': 36, 'max': 45, 'rain': 6.94}
    }
	highlight = {'min': 40, 'max': 80, 'rain': 5}

	return render_template('index.html', city=city, months=months,
		weather=weather,highlight=highlight)
'''
404页面
'''
@app.errorhandler(404)
def not_found(e):
    return render_template('404.html')

if __name__ == '__main__':
    app.run(port=1012, debug=True)

index.html



{% extends 'bootstrap/base.html' %}
{% import 'macros.html' as macros %}

{% block title %}Weather Averages for {{ city }}{% endblock %}

{% block navbar %}
    <nav class="navbar navbar-inverse" role="navigation">
        <div class="container">
            <a class="navbar-brand" href="#">Weather</a>
        </div>    
    </nav>
{% endblock %}

{% block content %}
    <div class="container">
        <h1>Weather Averages</h1>
        <h2>{{ city }}</h2>
        <table class="table table-hover">
            <tr>
                <th>Month</th>
                <th>Min</th>
                <th>Max</th>
                <th>Rainfall</th>
            </tr>
            {% for month in months %}
                {{ macros.weather_row(month,
                                      weather[month]['min'],
                                      weather[month]['max'], 
                                      weather[month]['rain'],
                                      highlight['min'],
                                      highlight['max'],
                                      highlight['rain']) }}
            {% endfor %}
        </table>
    </div>    
{% endblock %}

macros.html

<!-- 定义函数 值与变量 当h1满足条件时加粗字体 -->
{% macro weather_cell(value, hl) %}
   <td{% if hl %} class="warning"{% endif %}>{{ value }}</td>
{% endmacro %}



{% macro weather_row(month, min, max, rain, hl_min, hl_max, hl_rain) %}
    <tr>
        <td>{{ month }}</td>
        {{ weather_cell(min, min <= hl_min) }}
        {{ weather_cell(max, max >= hl_max) }}
        {{ weather_cell(rain, rain >= hl_rain) }}
    </tr>
{% endmacro %}
<!-- 函数调用函数  当min 低于预定值时会加粗显示-->


{% macro weather_cell(value, hl) %}
    <td{% if hl %} class="warning"{% endif %}>{{ value }}</td>
{% endmacro %}

404.html

{% extends 'base.html' %}

{% block title %}Not Found{% endblock %}

{% block page_content %}
    <h1>404 页面未找到</h1>
    <p><a href="{{ url_for('index') }}">Return to home page</a></p>
{% endblock %}

base.html

{% extends 'bootstrap/base.html' %}

{% block navbar %}
    <nav class="navbar navbar-inverse" role="navigation">
        <div class="container">
            <a class="navbar-brand" href="{{ url_for('index') }}">Weather</a>
        </div>    
    </nav>
{% endblock %}
{%- block metas %}
<meta charset="utf-8">
{%- endblock metas %}

{% block content %}
    <div class="container">
        {% block page_content %}{% endblock %}
    </div>
{% endblock %}

request 函数

from flask import Flask, render_template, request
from flask_bootstrap import Bootstrap

app = Flask(__name__)
bootstrap = Bootstrap(app)

@app.route('/', methods=['GET', 'POST'])
def index():
    name = None
    print request.form
    if request.method == 'POST' and 'name' in request.form:
        name = request.form['name']
    return render_template('index.html', name=name)

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

index.html

{% extends "bootstrap/base.html" %}

{% block title %}Form Example{% endblock %}

{% block navbar %}
    <nav class="navbar navbar-inverse" role="navigation">
        <div class="container">
            <a class="navbar-brand" href="{{ url_for('index') }}">Hello</a>
        </div>
    </nav>
{% endblock %}

{% block content %}
    <div class="container">
        <form method="POST" action="">
            What is your name? <input type="text" name="name">
            <input type="submit" name="submit" value="Submit">
        </form>
        {% if name %}
            <h1>Hello, {{ name }}!</h1>
        {% endif %}
    </div>
{% endblock %}

限定上传长度

hello.py

from flask import Flask, render_template
from flask_bootstrap import Bootstrap
from flask_wtf  import Form

from wtforms import StringField, SubmitField
from wtforms.validators import Required, Length

app = Flask(__name__)
app.config['SECRET_KEY'] = 'top secret!'
bootstrap = Bootstrap(app)


class NameForm(Form):
    name = StringField('What is your name?', validators=[Required(),
                                                         Length(1, 16)])
    submit = SubmitField('Submit')


@app.route('/', methods=['GET', 'POST'])
def index():
    name = None
    form = NameForm()
    if form.validate_on_submit():
        name = form.name.data
        form.name.data = ''
    return render_template('index.html', form=form, name=name)


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

index.html

{% extends "bootstrap/base.html" %}

{% block title %}Form Example{% endblock %}

{% block navbar %}
    <nav class="navbar navbar-inverse" role="navigation">
        <div class="container">
            <a class="navbar-brand" href="{{ url_for('index') }}">Hello</a>
        </div>    
    </nav>
{% endblock %}

{% block content %}
    <div class="container">
        <form method="POST" action="">
            {{ form.name.label }} {{ form.name(size=16) }}
            {% for error in form.name.errors %}
                {{ error }}
            {% endfor %}
            <br>
            {{ form.submit() }}
            {{ form.hidden_tag() }}
        </form>
        {% if name %}
            <h1>Hello, {{ name }}!</h1>
        {% endif %}
    </div>
{% endblock %}

bootstrap美化表单

hello.py

from flask import Flask, render_template
from flask_bootstrap import Bootstrap
from flask_wtf  import Form

from wtforms import StringField, SubmitField
from wtforms.validators import Required, Length

app = Flask(__name__)
app.config['SECRET_KEY'] = 'top secret!'
bootstrap = Bootstrap(app)


class NameForm(Form):
    name = StringField('What is your name?', validators=[Required(),
                                                         Length(1, 16)])
    submit = SubmitField('Submit')


@app.route('/', methods=['GET', 'POST'])
def index():
    name = None
    form = NameForm()
    if form.validate_on_submit():
        name = form.name.data
        form.name.data = ''
    return render_template('index.html', form=form, name=name)


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

index.html


{% extends "bootstrap/base.html" %}
{% import "bootstrap/wtf.html" as wtf %}

{% block title %}Form Example{% endblock %}

{% block navbar %}
    <nav class="navbar navbar-inverse" role="navigation">
        <div class="container">
            <a class="navbar-brand" href="{{ url_for('index') }}">Hello</a>
        </div>
    </nav>
{% endblock %}

{% block content %}
    <div class="container">
        <div class="row">
            <div class="col-md-3">
                {{ wtf.quick_form(form) }}
                {% if name %}
                    <h1>Hello, {{ name }}!</h1>
                {% endif %}
            </div>
        </div>
    </div>
{% endblock %}

文件上传

├── static
│ └── uploads
│ └── README.md 文件会上传到此目录
├── templates
│ └── index.html
└── upload.py

3 directories, 3 files

upload.py

import os
import imghdr

from flask import Flask, render_template
from flask_bootstrap import Bootstrap
from flask_wtf  import Form
from wtforms import FileField, SubmitField, ValidationError

app = Flask(__name__)
app.config['SECRET_KEY'] = 'top secret!'
bootstrap = Bootstrap(app)


class UploadForm(Form):
    image_file = FileField('Image file')
    submit = SubmitField('Submit')

    def validate_image_file(self, field):
        if field.data.filename[-4:].lower() != '.jpg':
            raise ValidationError('Invalid file extension')
        if imghdr.what(field.data) != 'jpeg':
            raise ValidationError('Invalid image format')


@app.route('/', methods=['GET', 'POST'])
def index():
    image = None
    form = UploadForm()
    if form.validate_on_submit():
        image = 'uploads/' + form.image_file.data.filename
        form.image_file.data.save(os.path.join(app.static_folder, image))
    return render_template('index.html', form=form, image=image)


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

{% extends "bootstrap/base.html" %}
{% import "bootstrap/wtf.html" as wtf %}

{% block title %}File Upload Example{% endblock %}

{% block navbar %}
    <nav class="navbar navbar-inverse" role="navigation">
        <div class="container">
            <a class="navbar-brand" href="{{ url_for('index') }}">Upload</a>
        </div>
    </nav>
{% endblock %}

{% block content %}
    <div class="container">
        <div class="row">
            <div class="col-md-4">
                {{ wtf.quick_form(form, enctype='multipart/form-data') }}
            </div>
        </div>
        {% if image %}
            <img src="{{ url_for('static', filename=image) }}">
        {% endif %}
    </div>
{% endblock %}

session 信息

plus.py

from flask import Flask, render_template, session
app = Flask(__name__)
app.config['SECRET_KEY'] = 'top secret!'


@app.route('/')
def index():
    print session
    if 'count' not in session:
        session['count'] = 1
    else:
        session['count'] += 1
    return render_template('index.html', count=session['count'])


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

index.html

<h1>You have seen this page {{ count }} times.</h1>
<p>Hit refresh to increase.</p>

页面访问统计 以及时间

plus1.py

from datetime import datetime
from flask import Flask, render_template, session, g
app = Flask(__name__)
app.config['SECRET_KEY'] = 'top secret!'


@app.before_request
def before_request():
    if not 'count' in session:
        session['count'] = 1
    else:
        session['count'] += 1
    g.when = datetime.now().strftime('%H:%M:%S')


@app.route('/')
def index():
    return render_template('index.html', count=session['count'], when=g.when)


@app.route('/other')
def other():
    return render_template('other.html', count=session['count'], when=g.when)


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

index.html

<h1>Index Page</h1>
<p>You have a total of {{ count }} page views in this site, the last of which was at {{ when }}.</p>
<p><a href="{{ url_for('other') }}">Click here</a> to see the other page.</p>

other.html

<h1>Other Page</h1>
<p>You have a total of {{ count }} page views in this site, the last of which was at {{ when }}.</p>
<p><a href="{{ url_for('index') }}">Click here</a> to see the index page.</p>

多种请求 响应方式

responses.py

from flask import Flask, render_template, make_response, jsonify, redirect, \
    url_for
app = Flask(__name__)


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


@app.route('/text')
def text():
    return render_template('text.txt'), 200, {'Content-Type': 'text/plain'}


@app.route('/xml')
def xml():
    return '<h1>this is shown as <b>XML</b> in the browser</h1>', 200, \
           {'Content-Type': 'application/xml'}


@app.route('/json')
def json():
    return jsonify({'first_name': 'John', 'last_name': 'Smith'})


@app.route('/redirect')
def redir():
    return redirect(url_for('text'))


@app.route('/cookie')
def cookie():
    resp = redirect(url_for('index'))
    resp.set_cookie('cookie', 'Hello, I\'m a cookie')
    return resp


@app.route('/error')
def error():
    return 'Bad Request', 400


@app.route('/response')
def response():
    resp = make_response(render_template('text.txt'))
    resp.headers['Content-Type'] = 'text/plain'
    return resp


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

text.text

This page contains plain text.
Use your back button to go back to the index page.

index.html


<h1>This page contains HTML</h1>
<p>
    Cookie: 
    {% if 'cookie' in request.cookies %}
        <b>{{ request.cookies['cookie'] }}</b>
    {% else %}
        not set
    {% endif %}
</p>
<p><a href="{{ url_for('text') }}">Click here</a> to view a page that contains plain text.</p>
<p><a href="{{ url_for('xml') }}">Click here</a> to view a page that contains XML data.</p>
<p><a href="{{ url_for('json') }}">Click here</a> to view a page that contains JSON data.</p>
<p><a href="{{ url_for('redir') }}">Click here</a> to view a page that redirects to the plain text page.</p>
<p><a href="{{ url_for('cookie') }}">Click here</a> to view a page that sets a cookie and then redirects back to this page.</p>
<p><a href="{{ url_for('response') }}">Click here</a> to view a page that shows plain text through a response object.</p>

from表单取值

复选框

<div class="form-group">
    <label class="control-label col-sm-2 col-lg-2 text-navy" for="id_title">操作系统</label>
        <div class="col-sm-10">
            <input type="checkbox" name="hobby" value="football"/>足球
            <input type="checkbox" name="hobby" value="basketball" checked="checked"/>篮球
            <input type="checkbox" name="hobby" value="pingpong" checked="checked" />乒乓球
        </div>
</div>

-----
@app.route('/aa', methods=['POST'])
def assts_aa():
    tmp = request.values.getlist('hobby')
    print tmp
    for i in tmp
    	pass
    get_id = 1

单选框

<div class="form-group">
<label class="control-label col-sm-2 col-lg-2 text-navy" for="id_title">操作系统</label>
    <div class="col-sm-10">
         <input type="radio" name="sex" value="1" checked="checked" />男
         <input type="radio" name="sex" value="0" />女
    </div>
</div>


@app.route('/aa', methods=['POST'])
def assts_aa():
    print request.form.get('sex','')

flask获取上传表单(列表形式)

# html内容
<div class="form-group">
    <label class="col-sm-2 control-label">项目组:</label>
    <div class="col-sm-10">
        <! -- start-->
        {% if project_group_list %}
            {% for foo in project_group_list %}
                <input id="id_title" type="checkbox"  name="project_group_name"
                           value="{{ foo['id'] }}"/>{{ foo['project_group_name'] }}&nbsp&nbsp
            {% endfor %}

        {% endif %}
        <! -- end-->
    </div>
</div>

# 上传的表单数据
project_group_name:1
project_group_name:2
project_group_name:3
project_group_name:4
project_group_name:5

# python flask获取列表
project_group_name = request.values.getlist('project_group_name')
print projects_id

# 返回值
[u'1', u'2', u'3', u'4', u'5']

# 传给models进行处理
status, result= models.project_id_project_group_id_correlation(project_group_name_id_list_s, project_name)
if not status:
    return json.dumps({'code': 400, 'result': result})
return json.dumps({'code': 200, 'result': result})


# models代码
'''
项目ID.项目组ID关联关系.保存
'''
def project_id_project_group_id_correlation(project_group_name_id_list_s, project_name):
    SQL_GET_PROJECT_NAME_ID = '''
    SELECT `id` FROM project WHERE `project_name`=%s
    '''
    sql = SQL_GET_PROJECT_NAME_ID
    args =(project_name,)
    rt_cnt , rt_list = dbutils.execute_sql(sql, args, True)
    # 获取刚添加项目ID
    project_id =  rt_list[0][0]

    SQL_PROJECT_ID_PROJECT_GROUP_ID_CORRELATION='''
    INSERT INTO `project_id_project_group_id` (`project_id`, `project_group_id`) VALUES
    '''
    sql_insert = SQL_PROJECT_ID_PROJECT_GROUP_ID_CORRELATION
    cnt = 0
    for project_group_name_id_list in project_group_name_id_list_s:
        if cnt == 0:
            sql_insert = sql_insert + '({project_id},{project_group_name_id_list})'.format(project_id=project_id,project_group_name_id_list=project_group_name_id_list)
        sql_insert = sql_insert + ' ,({project_id},{project_group_name_id_list})'.format(project_id=project_id,project_group_name_id_list=project_group_name_id_list)
        cnt = 1
    args = ()
    try:
        rt_cnt, rt_list = dbutils.execute_sql(sql_insert, args, False)
    except:
        return (False,u'保存项目id与项目组id关联失败')
    return (True, u'保存项目id与项目组id关联成功')