Python 烧瓶错误：werkzeug.routing.BuildError
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Flask error: werkzeug.routing.BuildError
提问by chenge
I modify the login of flaskr sample app, the first line get error. But www.html is in the template dir.
我修改了flaskr示例应用程序的登录，第一行出错。但是 www.html 在模板目录中。
return redirect(url_for('www'))
#return redirect(url_for('show_entries'))
display error：
显示错误：
werkzeug.routing.BuildError
BuildError: ('www', {}, None)
采纳答案by unmounted
return redirect(url_for('www'))would work if you have a function somewhere else like this:
return redirect(url_for('www'))如果您在其他地方有这样的功能，它将起作用：
@app.route('/welcome')
def www():
return render_template('www.html')
url_forlooks for a function, you pass it the nameof the function you are wanting to call. Think of it like this:
url_for寻找一个函数，您将要调用的函数的名称传递给它。可以这样想：
@app.route('/login')
def sign_in():
for thing in login_routine:
do_stuff(thing)
return render_template('sign_in.html')
@app.route('/new-member')
def welcome_page():
flash('welcome to our new members')
flash('no cussing, no biting, nothing stronger than gin before breakfast')
return redirect(url_for('sign_in')) # not 'login', not 'sign_in.html'
You could also do return redirect('/some-url'), if that is easier to remember. It is also possible that what you want, given your first line, is just return render_template('www.html').
你也可以这样做return redirect('/some-url')，如果这更容易记住的话。考虑到您的第一行，您想要的也可能只是return render_template('www.html').
And also, not from shuaiyuancn's comment below, if you are using blueprints, url_forshould be invoked as url_for('blueprint_name.func_name')Note you aren't passing the object, rather the string.See documentation here.
而且，不是从下面的 shuaiyuancn 的评论中，如果您使用的是蓝图，url_for则应调用为url_for('blueprint_name.func_name')注意您不是传递对象，而是字符串。请参阅此处的文档。
回答by David Ferris
Assuming that def www():is already defined (as suggested by unmounted's awesome answer), this error can also be thrown if you are using a blueprint which has not been registered.
假设def www():已经定义了（正如 unmounted 的很棒的答案所建议的那样），如果您使用的是尚未注册的蓝图，也可能会引发此错误。
Make sure to register these when appis first instantiated. For me it was done like this:
确保在app第一次实例化时注册这些。对我来说，它是这样完成的：
from project.app.views.my_blueprint import my_blueprint
app = Flask(__name__, template_folder='{}/templates'.format(app_path), static_folder='{}/static'.format(app_path))
app.register_blueprint(my_blueprint)
And withinmy_blueprint.py:
并且在my_blueprint.py：
from flask import render_template, Blueprint
from flask_cors import CORS
my_blueprint = Blueprint('my_blueprint', __name__, url_prefix='/my-page')
CORS(my_blueprint)
@metric_retriever.route('/')
def index():
return render_template('index.html', page_title='My Page!')
回答by user1002119
I came across this error
我遇到了这个错误
BuildError: ('project_admin', {}, None)
BuildError: ('project_admin', {}, None)
when I had a call like
当我接到一个电话时
return redirect(url_for('project_admin'))
return redirect(url_for('project_admin'))
in which I was trying to reference the project_adminfunction within my Blueprint. To resolve the error, I added a dot before the name of the function, like this:
我试图project_admin在我的蓝图中引用该函数。为了解决该错误，我在函数名称前添加了一个点，如下所示：
return redirect(url_for('.project_admin'))
return redirect(url_for('.project_admin'))
and voila, my problem was solved.
瞧，我的问题解决了。
