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  • 【Flask】Flask快速玩框架

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    快速玩Flask框架，为微博做些准备

    part 1 python程序
    1. from flask importFlask, render_template, session, redirect, url_for, flash
    2. from flask_bootstrap importBootstrap
    3. from flask_moment importMoment
    4. from datetime import datetime
    5. from flask_wtf importForm
    6. from wtforms importStringField,SubmitField
    7. from wtforms.validators importRequired
    8. from flask_sqlalchemy importSQLAlchemy
    9. from flask_script importManager
    10. import os
    11. basedir = os.path.abspath(os.path.dirname(__file__))
    12. app =Flask(__name__)
    13. #wtf表单验证
    14. app.config['SECRET_KEY']='hard to guess string'
    15. #数据库URL
    16. app.config['SQLALCHEMY_DATABASE_URI']= \
    17. 'sqlite:///'+ os.path.join(basedir,'data.sqlite')
    18. #每次请求结束后自动提交数据变动
    19. app.config['SQLALCHEMY_COMMIT_ON_TEARDOWN']=True
    20. bootstrap =Bootstrap(app)
    21. moment =Moment(app)
    22. db =SQLAlchemy(app)
    23. manager =Manager(app)
    24. #wtf表单类
    25. classNameForm(Form):
    26. name =StringField('What is your name?', validators=[Required()])
    27. submit =SubmitField('Submit')
    28. #数据库中的table类
    29. classRole(db.Model):
    30. __tablename__ ='roles'
    31. id = db.Column(db.Integer, primary_key=True)
    32. name = db.Column(db.String(64), unique=True)
    33. users = db.relationship('User', backref='role', lazy='dynamic')
    34. def __repr__(self):
    35. return'<Role %r>'% self.name
    36. classUser(db.Model):
    37. __tablename__ ='users'
    38. id = db.Column(db.Integer, primary_key=True)
    39. username = db.Column(db.String(64), unique=True, index=True)
    40. role_id = db.Column(db.Integer, db.ForeignKey('roles.id'))
    41. def __repr__(self):
    42. return'<User %r>'% self.username
    43. #主页
    44. @app.route('/', methods=['GET','POST'])
    45. def index():
    46. form =NameForm()
    47. if form.validate_on_submit():
    48. user =User.query.filter_by(username=form.name.data).first()
    49. if user isNone:
    50. user =User(username=form.name.data)
    51. db.session.add(user)
    52. session['known']=False
    53. else:
    54. session['known']=True
    55. session['name']= form.name.data
    56. form.name.data =''
    57. return redirect(url_for('index'))
    58. return render_template('user.html', form=form, name=session.get('name'), known=session.get('known',False),
    59. current_time=datetime.utcnow())
    60. #404页
    61. @app.errorhandler(404)
    62. def page_not_found(e):
    63. return render_template('404.html'),404
    64. #500页
    65. @app.errorhandler(500)
    66. def internal_server_error(e):
    67. return render_template('500.html'),500
    68. #manager.run() 用于是服务器在命令行运行
    69. if __name__ =='__main__':
    70. app.run(debug=True)
    71. # manager.run()
    part 2 基模板
    主页面：
    1. <!-- 基于bootstrap/base.html的基模板 默认有导航栏 page——content可重写-->
    2. {% extends "bootstrap/base.html" %}
    3. <!-- 导入moment.js -->
    4. {% block scripts %}
    5. {{ super() }}
    6. {{ moment.include_moment() }}
    7. {% endblock %}
    8. {% block title %}Flasky{% endblock %}
    9. {% block head %}
    10. {{ super() }}
    11. <linkrel="shortcut icon"href="{{ url_for('static', filename = 'favicon.ico') }}"
    12. type="image/x-icon">
    13. <linkrel="icon"href="{{ url_for('static', filename = 'favicon.ico') }}"
    14. type="image/x-icon">
    15. {% endblock %}
    16. {% block navbar %}
    17. <divclass="navbar navbar-inverse"role="navigation">
    18. <divclass="container">
    19. <divclass="navbar-header">
    20. <buttontype="button"class="navbar-toggle"
    21. data-toggle="collapse"data-target=".navbar-collapse">
    22. <spanclass="sr-only">Toggle navigation</span>
    23. <spanclass="icon-bar"></span>
    24. <spanclass="icon-bar"></span>
    25. <spanclass="icon-bar"></span>
    26. </button>
    27. <aclass="navbar-brand"href="/">Flasky</a>
    28. </div>
    29. <divclass="navbar-collapse collapse">
    30. <ulclass="nav navbar-nav">
    31. <li><ahref="/">Home</a></li>
    32. </ul>
    33. </div>
    34. </div>
    35. </div>
    36. {% endblock %}
    37. {% block content %}
    38. <!-- 弹出警告信息-->
    39. <divclass="container">
    40. {% for message in get_flashed_messages() %}
    41. <divclass="alert alert-warning">
    42. <buttontype="button"class="close"data-dismiss="alert">×</button>
    43. {{ message }}
    44. </div>
    45. {% endfor %}
    46. {% block page_content %}{% endblock %}
    47. </div>
    48. {% endblock %}
    自定义错误页面：
    1. <!DOCTYPE html>
    2. {% extends "base.html" %}
    3. {% block title %}Flasky - Page Not Found{% endblock %}
    4. {% block page_content %}
    5. <divclass="page-header">
    6. <h1>Not Found</h1>
    7. </div>
    8. {% endblock %}
     





    作者：苏徽.W

    出处：http://www.cnblogs.com/perfe/

    本文版权归作者和博客园共有，欢迎转载，希望大家能够多多评论交流哦。

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  • 原文地址：https://www.cnblogs.com/perfe/p/5647790.html
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