python - flaskweb开发这本书中，自定义错误页面无法渲染？
问题描述
按照书上的步骤来的1.在bootstrap中编写了base.html，放在templates/bootstrap目录下的代码：
1 {% block doc -%} 2 <!DOCTYPE html> 3 <html{% block html_attribs %}{% endblock html_attribs %}> 4 {%- block html %} 5 <head> 6 {%- block head %} 7 <title>{% block title %}{{title|default}}{% endblock title %}</title> 8 9 {%- block metas %} 10 <meta name='viewport' content='width=device-width, initial-scale=1.0'> 11 {%- endblock metas %} 12 13 {%- block styles %} 14 <!-- Bootstrap --> 15 <link href='https://www.haobala.com/wenda/{{bootstrap_find_resource(’css/bootstrap.css’, cdn=’bootstrap’)}}' rel='stylesheet'> 16 {%- endblock styles %} 17 {%- endblock head %} 18 </head> 19 <body{% block body_attribs %}{% endblock body_attribs %}> 20 {% block body -%} 21 {% block navbar %} 22 {%- endblock navbar %} 23 {% block content -%} 24 {%- endblock content %} 25 26 {% block scripts %} 27 <script src='https://www.haobala.com/wenda/{{bootstrap_find_resource(’jquery.js’, cdn=’jquery’)}}'></script> 28 <script src='https://www.haobala.com/wenda/{{bootstrap_find_resource(’js/bootstrap.js’, cdn=’bootstrap’)}}'></script> 29 {%- endblock scripts %} 30 {%- endblock body %} 31 </body> 32 {%- endblock html %} 33 </html> 34 {% endblock doc -%}
然后在templates下编写了base.html
1 {% extends 'bootstrap/base.html' %} 2 {% block title %}Flasky{% endblock %} 3 {% block navbar %} 4 5 6 <p role='navigation'> 7 <p class='container'> 8 <p class='navbar-header'> 9 <button type='button' 10 data-toggle='collapse' data-target='.navbar-collapse'> 11 <span class='sr-only'>Toggle navigation</span> 12 <span class='icon-bar'></span> 13 <span class='icon-bar'></span> 14 <span class='icon-bar'></span> 15 </button> 16 <a href='https://www.haobala.com/'>Flasky</a> 17 </p> 18 <p class='navbar-collapse collapse'> 19 <ul class='nav navbar-nav'> 20 <li><a href='https://www.haobala.com/'>Home</a></li> 21 </ul> 22 </p> 23 </p> 24 </p> 25 26 27 {% endblock %} 28 29 {% block content %} 30 31 32 <p class='container'> 33 {% block page_content %}{% endblock %} 34 </p> 35 36 37 {% endblock %}
还有404.html
1 { % extends 'base.html' % } 2 { % block title % }Flasky - Page Not Found{ % endblock % } 3 { % block page_content % } 4 <p class='page-header'> 5 <h1>Not Found</h1> 6 </p> 7 { % endblock % }~
接着是python脚本语言
1 from flask import Flask,render_template 2 from flask_bootstrap import Bootstrap 3 4 app = Flask(__name__) 5 Bootstrap(app) 6 7 @app.route(’/user/<name>’) 8 def user(name): 9 return render_template(’user.html’, name = name) 10 @app.errorhandler(404) 11 def page_not_found(e): 12 return render_template(’404.html’),404 13 14 @app.errorhandler(500) 15 def internal_server_error(e): 16 return render_template(’500.html’),500 17 if __name__ == '__main__': 18 app.run()
可是最后在网页上却显示这样的结果:
我早浏览器中输入的地址是：127.0.0.1:5000/ab
{ % extends 'base.html' % } { % block title % }Flasky - Page Not Found{ % endblock % } { % block page_content % }Not Found{ % endblock % }
问题解答
回答1：404.html中花括号和百分号间不要有空格
回答2：你的python文件中漏了一个bootstrap = Bootstrap（app）少了bootstrap = 模板引擎无法找到bootstrap模块目录下的模板
回答3：python脚本里第五行：Bootstrap(app)应该找个变量保存起来，如：bootstrap = Bootstrap(app)不然引用计数为0，又给释放掉了，等于没初始化。
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