Python NoReverseMatch at/13/download/in Django

我一直在尝试使用Django开发一个小应用程序。一切正常。然后，我添加了一个“下载”按钮来向用户发送邮件。每当我点击该按钮时，就会出现以下错误：

NoReverseMatch at /13/download/
Reverse for 'about' with arguments '('',)' not found. 1 pattern(s) tried: ['(?P<pk>[0-9]+)/about/$']

URL.py：

from django.conf.urls import url,include
from . import views

app_name = 'set_goals'

urlpatterns = [
    url(r'^$',views.index,name='index'),
    url(r'^(?P<pk>[0-9]+)/about/$',views.about,name='about'),
    url(r'^(?P<pk>[0-9]+)/download/$', views.download, name='download'),
]

从django.conf.url导入url，包括
从…起导入视图
应用程序名称='设置目标'
URL模式=[
url（r'^$'，views.index，name='index'），
url（r'^（？P[0-9]+）/about/$，views.about，name='about'），
url（r'^（？P[0-9]+）/download/$'，views.download，name='download'），
]

模板：

    {% extends 'base.html' %}
{% block title %}Immediate{% endblock %}
{% block content %}

<div class="container">
    {% if user.is_authenticated %}
       <div class="container">
           <div class="row">
               <div class="col-md-6">
                   {% if immediate.body %}
                   <h2>{{immediate.title}}</h2>
                   <pre>{{immediate.body}}</pre>
                   {% else %}
                   <h2>Immediate Goals</h2>
                   <p>Yet to be placed!</p>
                   {% endif %}
               </div>

               <div class="col-md-6">
                   {% if necessary.body %}
                   <h2>{{ necessary.title }}</h2>
                   <pre>{{ necessary.body }}</pre>
                   {% else %}
                   <h2>Necessary Goals</h2>
                   <p>Yet to be placed!</p>
                   {% endif %}
               </div>
           </div>
           <div class="row">
               <div class="col-md-6">
                   {% if longterm.body %}
                   <h2>{{ longterm.title }}</h2>
                   <pre>{{ longterm.body }}</pre>
                   {% else %}
                   <h2>Longterm Goals</h2>
                   <p>Yet to be placed!</p>
                   {% endif %}
               </div>

               <div class="col-md-6">
                   {% if notnecessary.body %}
                   <h2>{{ notnecessary.title }}</h2>
                   <pre>{{ notnecessary.body }}</pre>
                   {% else %}
                   <h2>Not Necessary Goals</h2>
                   <p>Yet to be placed!</p>
                   {% endif %}
               </div>
           </div>
           <div class="row">
               <a href="{% url 'set_goals:download' user.id %}" class="btn btn-primary">Download &rarr;</a>
           </div>
       </div>
    {% else %}
        <h2>Please Login First</h2>
    {% endif%}
</div>

{% endblock %}

{%extends'base.html%}
{%block title%}立即的{%endblock%}
{%block content%}
{%if user.u经过身份验证%}
{%if immediate.body%}
{{immediate.title}}
{{immediate.body}}
{%else%}
近期目标
还有待安置

{%endif%}
{%如有必要。正文%}
{{必要的.title}
{{必需的.body}
{%else%}
必要目标
还有待安置

{%endif%}
{%if longterm.body%}
{{longterm.title}
{{longterm.body}}
{%else%}
长期目标
还有待安置

{%endif%}
{%如果没有必要。正文%}
{{notneedly.title}}
{{notneedly.body}}
{%else%}
不必要的目标
还有待安置

{%endif%}
{%else%}
请先登录
{%endif%}
{%endblock%}

下载.html：

{%extends'base.html%}
{%block title%}立即的{%endblock%}
{%block content%}
{%if user.u经过身份验证%}
{%if immediate.body%}
{{immediate.title}}
{{immediate.body}}
{%else%}
近期目标
还有待安置

{%endif%}
{%如有必要。正文%}
{{必要的.title}
{{必需的.body}
{%else%}
必要目标
还有待安置

{%endif%}
{%if longterm.body%}
{{longterm.title}
{{longterm.body}}
{%else%}
长期目标
还有待安置

{%endif%}
{%如果没有必要。正文%}
{{notneedly.title}}
{{notneedly.body}}
{%else%}
不必要的目标
还有待安置

{%endif%}
{%else%}
请先登录
{%endif%}
{%endblock%}

当我点击下载按钮时，我得到了上面的错误。这里出了什么错？如何纠正？我是新手。请帮帮我。提前谢谢

通常，当呈现模板中的模板标记出错时，会发生此错误

django将在呈现之前检查所有模板标记，如果模板标记中存在任何不匹配或错误。它将引发此异常

---

好的，问题可能与

{%url'about'.

标记有关，该标记在

下载.html

中看不到。它可能在

base.html

中。查找该模板标记。这是作为答案发布的，但它不会尝试回答问题。它可能是一条注释。

    {% extends 'base.html' %}
{% block title %}Immediate{% endblock %}
{% block content %}

<div class="container">
    {% if user.is_authenticated %}
       <div class="container">
           <div class="row">
               <div class="col-md-6">
                   {% if immediate.body %}
                   <h2>{{immediate.title}}</h2>
                   <pre>{{immediate.body}}</pre>
                   {% else %}
                   <h2>Immediate Goals</h2>
                   <p>Yet to be placed!</p>
                   {% endif %}
               </div>

               <div class="col-md-6">
                   {% if necessary.body %}
                   <h2>{{ necessary.title }}</h2>
                   <pre>{{ necessary.body }}</pre>
                   {% else %}
                   <h2>Necessary Goals</h2>
                   <p>Yet to be placed!</p>
                   {% endif %}
               </div>
           </div>
           <div class="row">
               <div class="col-md-6">
                   {% if longterm.body %}
                   <h2>{{ longterm.title }}</h2>
                   <pre>{{ longterm.body }}</pre>
                   {% else %}
                   <h2>Longterm Goals</h2>
                   <p>Yet to be placed!</p>
                   {% endif %}
               </div>

               <div class="col-md-6">
                   {% if notnecessary.body %}
                   <h2>{{ notnecessary.title }}</h2>
                   <pre>{{ notnecessary.body }}</pre>
                   {% else %}
                   <h2>Not Necessary Goals</h2>
                   <p>Yet to be placed!</p>
                   {% endif %}
               </div>
           </div>
           <div class="row">
               <a href="{% url 'set_goals:download' user.id %}" class="btn btn-primary">Download &rarr;</a>
           </div>
       </div>
    {% else %}
        <h2>Please Login First</h2>
    {% endif%}
</div>

{% endblock %}

    {% extends 'base.html' %}
{% block title %}Immediate{% endblock %}
{% block content %}

<div class="container">
    {% if user.is_authenticated %}
       <div class="container">
           <div class="row">
               <div class="col-md-6">
                   {% if immediate.body %}
                   <h2>{{immediate.title}}</h2>
                   <pre>{{immediate.body}}</pre>
                   {% else %}
                   <h2>Immediate Goals</h2>
                   <p>Yet to be placed!</p>
                   {% endif %}
               </div>

               <div class="col-md-6">
                   {% if necessary.body %}
                   <h2>{{ necessary.title }}</h2>
                   <pre>{{ necessary.body }}</pre>
                   {% else %}
                   <h2>Necessary Goals</h2>
                   <p>Yet to be placed!</p>
                   {% endif %}
               </div>
           </div>
           <div class="row">
               <div class="col-md-6">
                   {% if longterm.body %}
                   <h2>{{ longterm.title }}</h2>
                   <pre>{{ longterm.body }}</pre>
                   {% else %}
                   <h2>Longterm Goals</h2>
                   <p>Yet to be placed!</p>
                   {% endif %}
               </div>

               <div class="col-md-6">
                   {% if notnecessary.body %}
                   <h2>{{ notnecessary.title }}</h2>
                   <pre>{{ notnecessary.body }}</pre>
                   {% else %}
                   <h2>Not Necessary Goals</h2>
                   <p>Yet to be placed!</p>
                   {% endif %}
               </div>
           </div>
       </div>
    {% else %}
        <h2>Please Login First</h2>
    {% endif%}
</div>

{% endblock %}

 Reverse for 'something' with arguments '('',)' not found. 1 pattern(s) tried: ['some path']

 In download.html there is no about tag may it will be in base.html.check may be it is in correct or update question with base.thml