Python Flask 导入错误：没有名为 Flask 的模块

Flask ImportError: No Module Named Flask

提问by bclayman

I'm following the Flask tutorial here:

我正在关注 Flask 教程：

http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i-hello-world

http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i-hello-world

I get to the point where I try ./run.py and I get:

我到了尝试 ./run.py 的地步，我得到：

Traceback (most recent call last):
  File "./run.py", line 3, in <module>
    from app import app
  File "/Users/benjaminclayman/Desktop/microblog/app/__init__.py", line 1, in <module>
    from flask import Flask
ImportError: No module named flask

This looks similar to:

这看起来类似于：

ImportError: No module named flask

导入错误：没有名为烧瓶的模块

But their solutions aren't helpful. For reference, I dohave a folder named flask which one user mentioned may cause issues.

但他们的解决方案没有帮助。作为参考，我确实有一个名为 flask 的文件夹，一位用户提到可能会导致问题。

采纳答案by Rollback

Try deleting the virtualenv you created. Then create a new virtualenv with:

尝试删除您创建的 virtualenv。然后使用以下命令创建一个新的 virtualenv：

virtualenv flask

Then:

然后：

cd flask

Now let's activate the virtualenv:

现在让我们激活 virtualenv：

source bin/activate

Now you should see (flask)on the left of the command line.

现在您应该会(flask)在命令行的左侧看到。

Let's install flask:

让我们安装烧瓶：

pip install flask

Then create a file named hello.py(NOTE: see UPDATE Flask 1.0.2below):

然后创建一个名为hello.py（注意：见UPDATE Flask 1.0.2下文）的文件：

from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello World!"

if __name__ == "__main__":
    app.run()

and run it with:

并运行它：

python hello.py

UPDATE Flask 1.0.2

更新烧瓶 1.0.2

With the new flask release there is no need to run the app from your script. hello.pyshould look like this now:

使用新的 Flask 版本，无需从脚本运行应用程序。 hello.py现在应该是这样的：

from flask import Flask
app = Flask(__name__)

@app.route("/")
def hello():
    return "Hello World!"

and run it with:

并运行它：

FLASK_APP=hello.py flask run

Make sure to be inside the folder where hello.pyis when running the latest command.

确保hello.py在运行最新命令时所在的文件夹内。

All the steps before the creation of the hello.py apply for this case as well

创建 hello.py 之前的所有步骤也适用于这种情况

回答by Julian

The only way I could solve was by adding my users python dir to myapp.wsgi file. As an example:

我能解决的唯一方法是将我的用户 python 目录添加到 myapp.wsgi 文件中。举个例子：

sys.path.append('/home/deployer/anaconda3/lib/python3.5/site-packages')

I guess that if you install the packages in the global enviroment, you should have no problem, but I had my python packages installed as user.

我想如果你在全局环境中安装包，你应该没有问题，但是我以用户身份安装了我的 python 包。

回答by aneesh joshi

I had a similar problem with flasgger.

我对 flasgger 也有类似的问题。

The reason for that was that I always use

原因是我总是使用

sudo pip install flask

sudo pip install flask

but for some reason that's not always the way to go. Sometimes, you have to do just

但出于某种原因，这并不总是可行的方法。有时，你只需要做

pip install flask

pip install flask

Another gotcha is that sometimes people type pip install Flaskwith the cap F

另一个问题是有时人们pip install Flask用大写 F打字

Posting this here in case somebody gets stuck. Let me know if it helped.

在这里发布以防万一有人被卡住。如果有帮助，请告诉我。

Useful Link: What is the difference between pip install and sudo pip install?

有用的链接： pip install 和 sudo pip install 有什么区别？

回答by NingAnMe

1. Edit /etc/apache2/sites-available/FlaskApp.conf
2. Add the following two lines before the "WSGIScriptAlias" line:

1. 编辑 /etc/apache2/sites-available/FlaskApp.conf
2. 在“WSGIScriptAlias”行之前添加以下两行：

WSGIDaemonProcess FlaskApp python-home=/var/www/FlaskApp/FlaskApp/venv/FlaskAppWSGIProcessGroup FlaskApp

WSGIDaemonProcess FlaskApp python-home=/var/www/FlaskApp/FlaskApp/venv/FlaskAppWSGIProcessGroup FlaskApp

1. Restart Apache:service apache2 restart

3. 重启阿帕奇：service apache2 restart

I'm following the Flask tutorial too.And I met the same problem.I found this way to fix it.

我也在关注 Flask 教程。我遇到了同样的问题。我找到了这种方法来解决它。

http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i-hello-world

http://blog.miguelgrinberg.com/post/the-flask-mega-tutorial-part-i-hello-world

回答by Norman Pilusa

I was using python2 but installed this: sudo apt-get install libapache2-mod-wsgi-py3

我正在使用 python2 但安装了这个： sudo apt-get install libapache2-mod-wsgi-py3

Instead of: sudo apt-get install libapache2-mod-wsgi

而不是： sudo apt-get install libapache2-mod-wsgi

Correcting the installation solved the no flask problem.

更正安装解决了无烧瓶问题。

回答by Miguel

Go to the flask file in microblog, then activate the virtual environment with source bin/activate, then go to flask/bin and install flask, and the rest of the packages, pip install flask. You will see flask listed inside bin directory. Try to run ./run.pyagain from microblog (or from wherever you have the file).

进入微博中的flask文件，然后用 激活虚拟环境source bin/activate，然后进入flask/bin安装flask，其余的包，pip install flask。您将看到在 bin 目录中列出了烧瓶。尝试./run.py从微博（或从任何有文件的地方）再次运行。

回答by Khalid Bin Huda

For python 3 use

对于 python 3 使用

pip3 install flask

pip3 安装烧瓶

回答by yunus

Even i too suggest u virtualenv, This might also solve ur problem.

即使我也建议你使用 virtualenv，这也可能解决你的问题。

sudo apt install python-flask

If u want to deploy in productionserver then go ahead with above solution else use virtualenv.

如果您想在生产服务器中部署，请继续上述解决方案，否则请使用 virtualenv。

回答by Abid

In my case the solution was as simple as starting up my virtual environment like so:

在我的情况下，解决方案就像启动我的虚拟环境一样简单：

$ venv/scripts/activate

$ venv/scripts/activate

It turns out I am still fresh to Python :)

事实证明我对 Python 还很陌生:)

回答by Tao W

enter your python interactive mode then:

进入你的python交互模式然后：

import sys

import sys

sys.path

sys.path

it will print your path. Check wether flask is installed in the sys.path.

它会打印你的路径。检查烧瓶是否安装在 sys.path 中。

For MacOS, python path is under /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages

对于 MacOS，python 路径在 /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages 下

But pip'll install python package by default under /Library/Python/2.7/site-packages

但是pip默认会在/Library/Python/2.7/site-packages下安装python包

That's why it doesn't work for MacOS.

这就是它不适用于 MacOS 的原因。