求助,ValueError: View function did not return a response

新手在学 flask 开发 T.T ，看到《 python web 开发》第十章的用户资料， 在搞 管理员级别的资料编辑器 那里出问题了， 视图函数抛出异常，不能返回响应 。百度，谷歌， sof 无果。找好久了没解决，心塞 所以来寻求帮助，谢谢能提供帮助的人。 这是整个文件夹 http://pan.baidu.com/s/1kV4sXcr

ValueError ValueError: View function did not return a response Traceback (most recent call last) File "D:\web_develop\venv\lib\site-packages\flask-0.12-py2.7.egg\flask\app.py", line 1994, in __call__ return self.wsgi_app(environ, start_response) File "D:\web_develop\venv\lib\site-packages\flask-0.12-py2.7.egg\flask\app.py", line 1985, in wsgi_app respOnse= self.handle_exception(e) File "D:\web_develop\venv\lib\site-packages\flask-0.12-py2.7.egg\flask\app.py", line 1540, in handle_exception reraise(exc_type, exc_value, tb) File "D:\web_develop\venv\lib\site-packages\flask-0.12-py2.7.egg\flask\app.py", line 1982, in wsgi_app respOnse= self.full_dispatch_request() File "D:\web_develop\venv\lib\site-packages\flask-0.12-py2.7.egg\flask\app.py", line 1615, in full_dispatch_request return self.finalize_request(rv) File "D:\web_develop\venv\lib\site-packages\flask-0.12-py2.7.egg\flask\app.py", line 1630, in finalize_request respOnse= self.make_response(rv) File "D:\web_develop\venv\lib\site-packages\flask-0.12-py2.7.egg\flask\app.py", line 1725, in make_response raise ValueError('View function did not return a response') ValueError: View function did not return a response 

##路由视图 views.py ：

@main.route('/edit-profile/<int:id>', methods=['GET', 'POST']) @login_required @admin_required def edit_profile_admin(id): user = User.query.get_or_404(id) form = EditProfileAdminForm(user=user) if form.validate_on_submit(): user.email = form.email.data user.username = form.username.data user.cOnfirmed= form.confirmed.data user.role = Role.query.get(form.role.data) user.name = form.name.data user.location = form.location.data user.about_me = form.about_me.data db.session.add(user) flash('The profile has been updated.') return redirect(url_for('.user', username=user.username)) form.email.data = user.email form.username.data = user.username form.confirmed.data = user.confirmed form.role.data = user.role_id form.name.data = user.name form.location.data = user.location form.about_me.data = user.about_me return render_template('edit_profile.html', form=form, user=user) 

##表单 forms.py:

class EditProfileAdminForm(FlaskForm): email = StringField('Email', validators=[Required(), Length(1, 64), Email()]) username = StringField('Username', validators=[ Required(), Length(1, 64), Regexp('^[A-Za-z][A-Za-z0-9_.]*$', 0, 'Username must have only letters,' 'number, dots or underscores')]) cOnfirmed= BooleanField('Confirmed') role = SelectField('Role', coerce=int) name = StringField('Real name', validators=[Length(0, 64)]) location = StringField('Location', validators=[Length(0, 64)]) about_me = TextAreaField('About me') submit = SubmitField('Submit') def __init__(self, user, *args, **kwargs): super(EditProfileAdminForm, self).__init__(*args, **kwargs) self.role.choices = [(role.id, role.name) for role in Role.query.order_by(Role.name).all()] self.user = user def validate_email(self, field): if field.data != self.user.email and \ User.query.filter_by(email=field.date).first(): raise ValidationError('Emai already registered.') def validate_username(self, field): if field.data !=self.user.username and \ User.query.filter_by(username=field.data).first(): raise ValidationError('Username already in use.') 

##模板 edit_profile.html ：

{% extends "base.html" %} {% import "bootstrap/wtf.html" as wtf %} {% block title %}Flasky - Edit Profile{% endblock %} {% block page_content %} <div class="page-header"> <h1>Edit Your Profile</h1> </div> <div class="col-md-4"> {{ wtf.quick_form(form) }} </div> {% endblock %}