blocks|key|1186364|text|似乎存在循环导入：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1186365|从kuchiyose.dashboard.views|offset|length|style|CODE|1186366|kuchiyose/dashboard/views.py导入|unordered-list-item|1186367|kuchiyose/__init__.py从kuchiyose.dashboard.models|1186368|kuchiyose/dashboard/models.py导入从kuchiyose|1186369|导入|1186370|1186371|有关更多信息，请参见例如Circular+(or+cyclic)+imports+in+Python+...|1186372|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/q/744373/1176601^0|0|1|P|0|0|S|0|0|L|M|Q|0|0|T|W|9|0|0|0|C|12|0|0^^$0|@$1|2|3|4|5|6|7|11|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|12|8|@$D|13|E|14|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|15|8|@$D|16|E|17|F|G]]|9|@]|A|$]]|$1|K|3|L|5|J|7|18|8|@$D|19|E|1A|F|G]|$D|1B|E|1C|F|G]]|9|@]|A|$]]|$1|M|3|N|5|J|7|1D|8|@$D|1E|E|1F|F|G]|$D|1G|E|1H|F|G]]|9|@]|A|$]]|$1|O|3|P|5|6|7|1I|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|1K|8|@]|9|@$D|1L|E|1M|1|1N]]|A|$]]|$1|T|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|10]]]]

there appears to be circular imports:

<ul>
<li><code>kuchiyose/__init__.py</code> imports from <code>kuchiyose.dashboard.views</code></li>
<li><code>kuchiyose/dashboard/views.py</code> imports from <code>kuchiyose.dashboard.models</code></li>
<li><code>kuchiyose/dashboard/models.py</code> imports from <code>kuchiyose</code></li>
</ul>

see e.g. <a href="https://stackoverflow.com/q/744373/1176601">Circular (or cyclic) imports in Python</a> for more info...

blocks|key|2845040|text|首先，感谢你的帮助。关于我的第二个问题：“如何在没有循环导入问题的情况下将Flask模型导入到视图中(当使用SQLAlchemy时)”，我找到了一个解决方案。它不是将SQLAlchemy对象设置到应用程序__init__.py文件中，而是设置到models.py文件本身中。这样，您就可以毫无问题地将其导入到views.py文件中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2845041|现在是我的models.py文件：|2845042|from+kuchiyose+import+app
from+flask.ext.sqlalchemy+import+SQLAlchemy

db+=+SQLAlchemy(app)|code-block|syntax|javascript|2845043|还有我的views.py|2845044|from+kuchiyose.dashboard+import+models|2845045|entityMap^0|2U|B|3E|9|4A|8|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|Q|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|R|$]]

First, thanks for the help. Concerning my second question : "How to import Flask models into views without having a circular import issue (when using SQLAlchemy)", i found a solution. It consists to setup the SQLAlchemy object not into the application <code>__init__.py</code>file but into the <code>models.py</code>file itself. With that, you can import it in your <code>views.py</code>file without problem. 

My models.py file, now:

<pre><code>from kuchiyose import app
from flask.ext.sqlalchemy import SQLAlchemy

db = SQLAlchemy(app)
</code></pre>

And my views.py 

<pre><code>from kuchiyose.dashboard import models
</code></pre>

blocks|key|720163|text|这是一个旧的，但在我的搜索中显示为最好的结果。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|720164|我有一个项目，它在几个不同的位置有模型声明，而不是一个合并的models.py文件，所以这个解决方案不是很理想。我发现在建立db对象后导入视图也很有效。|720165|from+flask+import+Flask
from+flask.ext.sqlalchemy+import+SQLAlchemy

app+=+Flask(__name__)
app.config.from_object('config')

db+=+SQLAlchemy(app)

#+Now+Register+routes
#+db+is+now+defined+so+app+import+db+will+now+work)
from+routes.user+import+user+as+user_routes
app.register_blueprint(user_routes)|code-block|syntax|javascript|720166|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

This is an old one but showed up as a top result in my search.

I have a project that has model declarations in a few different places rather than a consolidated models.py file so this solution wouldn't be ideal. I found importing your views AFTER establishing the db object works as well. 

<pre><code>from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config.from_object('config')

db = SQLAlchemy(app)

# Now Register routes
# db is now defined so app import db will now work)
from routes.user import user as user_routes
app.register_blueprint(user_routes)
</code></pre>

I'm trying to import an object named <code>db</code> (SQLAlchemy object) in in a module of my Flask Project in order to use the SQLAlchemy in my models (<code>models.py</code>). Assuming my package is named <code>Foo</code> and contains the <code>db</code> object in his <code>__init__.py</code> file , when i try to do a <code>from Foo import db</code>, i get the following error: 

<code>ImportError: cannot import name db</code>

I'm using Flask Blueprint to dispatch my project into two applications (dashboard and frontend) and each of them contains an <code>__init__.py</code>file. Only the <code>models.py</code> is throwing this error, i got some imports in my views file (as importing the login manager) and everything goes well. 

Any idea of what it could be ? 

UPDATE : The traceback

<pre><code>Traceback (most recent call last):
 File "run.py", line 4, in &lt;module&gt;
 from kuchiyose import app
 File "/path_to_project/kuchiyose/kuchiyose/__init__.py", line 60, in &lt;module&gt;
 from kuchiyose import dashboard, frontend
 File "/path_to_project/kuchiyose/kuchiyose/dashboard/__init__.py", line 10, in &lt;module&gt;
 from dashboard import views
 File "/path_to_project/kuchiyose/kuchiyose/dashboard/__init__.py", line 10, in &lt;module&gt;
 from dashboard import views
 File "/path_to_project/kuchiyose/kuchiyose/dashboard/views.py", line 8, in &lt;module&gt;
 from kuchiyose.dashboard.models import User
 File "/path_to_project/kuchiyose/kuchiyose/dashboard/models.py", line 3, in &lt;module&gt;
 from kuchiyose import db

ImportError: cannot import name db
</code></pre>

ImportError when importing from a lower module

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在尝试在我的Flask项目的一个模块中导入一个名为db (SQLAlchemy对象)的对象，以便在我的模型中使用SQLAlchemy (models.py)。假设我的包被命名为Foo，并且在他的__init__.py文件中包含db对象，当我尝试执行from Foo import db时，我得到以下错误：Import...

问从较低的模块导入时的ImportError
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