レコードのモデルインスタンスを取得してdeleteメソッドを実行する
urlspaternsの追記
/hello/urls.py
urlpatterns = [
path('', views.index, name='index'),
path('create', views.create, name='create'),
path('edit/<int:num>', views.edit, name='edit'),
path('delete/<int:num>', views.delete, name='delete'),
]
index.htmlの修正
/hello/templates/hello/index.html
{% for item in data %}
<tr>
<td>{{item}}</td>
<td><a href="{% url 'edit' item.id %}">Edit</a></td>
<td><a href="{% url 'delete' item.id %}">Delete</a></td>
</tr>
{% endfor %}
delete.htmlの作成
/hello/templates/hello/delete.html
<body class="container">
<h1 class="display-4 text-primary">{{title}}</h1>
<p>※以下のレコードを削除します。</p>
<table class="table">
<tr>
<th>ID</th>
<td>{{obj.id}}</td>
</tr>
<tr>
<th>Name</th>
<td>{{obj.name}}</td>
</tr>
<tr>
<th>Gender</th>
<td>
{% if obj.gender == False %} male {% endif %}
{% if obj.gender == True %} female {% endif %}
</td>
</tr>
<tr>
<th>Email</th>
<td>{{obj.mail}}</td>
</tr>
<tr>
<th>Age</th>
<td>{{obj.age}}</td>
</tr>
<tr>
<th>Birth</th>
<td>{{obj.birthday}}</td>
</tr>
<form action="{% url 'delete' id %}" method="post">
{% csrf_token %}
<tr><th></th><td>
<input type="submit" value="click" class="btn btn-primary">
</td></tr>
</form>
</table>
</body>
delete関数を作る
/hello/views.py
def delete(request, num):
friend = Friend.objects.get(id=num)
if(request.method == 'POST'):
friend.delete()
return redirect(to='/hello')
params = {
'title': 'Hello',
'id': num,
'obj': friend,
}
return render(request, 'hello/delete.html', params)

CRUDの基本は抑えました。