导入错误：没有名为 flask_wtf 的模块

Question

I am getting the error, ImportError: No module named flask_wtf . I tried every possible solution. I installed flask-wrf using -

$ flask/bin/pip install flask-wtf

Requirement already satisfied: flask-wtf in ./flask/lib/python2.7/site-packages
Requirement already satisfied: WTForms in ./flask/lib/python2.7/site-packages.

Please help me out with this issue.

I am sharing my code which shows error:

from flask_wtf import Form 
from wtforms import StringField, BooleanField
from wtforms.validators import DataRequired
    
class LoginForm(Form):
    openid = StringField('openid', validators=[DataRequired()])
    remember_me = BooleanField('remember_me', default=False)

Answer 1

I also have same issue. But installing Flask-WTF

  sudo pip install flask-wtf

I was able to resolve this issue.

Answer 2

Ensure you run the virtual environment's python rather than global python. I resolved this in my windows env through executing:

\inetpub\projectFolder\scripts\python.exe run.py

rather than just

python run.py

Also, make sure that you have installed the modules to the virtual environment rather than globally. Check that the modules exist appropriately - again under windows I checked for the file:

\inetpub\projectFolder\lib\site-packages\wtforms 

Answer 3

This is certainly a problem with virtual environment. I had the same problem and managed to get rid of errors with sudo pip install Flask-WTF while my virtual environment was active.

This solution, however, has got me into another package (email_validator) importing errors, though I was sure everything is installed as it should be. Now, instead of running flask run from terminal, I decided to run the whole application as it, by typing python3 application.py in my app directory, where application.py is my flask app.

In this way of running application I haven't come into any errors at all. If you want to run your app like me, be sure to set following conditional at the bottom of your application:

if __name__ == '__main__':
    app.run(debug=True)

(This will run your application in debug mode.)

I'm beginner level developer. It would be really nice for someone more experienced to explain logic behind this.

Edit: Once I ran my application like this, suddenly I can run it with flask run again, without any errors. Interesting.

Answer 4

In my case it worked after I installed it using pip3 instead of just pip. I didn't look into it enough to find out what was different but I'm seriously thinking of linking pip to pip3 in my venv.

Answer 5

I've had the same problem. The problem in my case was that Flask was installed globally , so flask run called the global package that didn't recognise the local package (Probably because the global call to python called python2, and my env was set to python3) . I solved it by uninstalling Flask globally and installing it only in the virtual environment.

Answer 6

使用 pip 安装 Flask-WTF 很简单：

pip install Flask-WTF

Answer 7

i did simple installation from flask_wtf and it worked the command is following

pip install Flask-WTF

please go to this link for more info https://flask-wtf.readthedocs.io/en/stable/install.html

Answer 8

我遇到了同样的问题 使用以下方法解决了它

conda install -c wakari flask-wtf

Answer 9

Note that if you are using Anaconda's python to run your app then you have to pip install flask-wtf from the Anaconda prompt and not from general command prompt. This helped me when I encountered this problem. Hope this helps!

Answer 10

You could install flask_wtf in conda using this command

conda install -c anaconda flask-wtf

Since your problem is due to virtualenv, installing this on conda will solve the problem. It did work for me.

Answer 11

就我而言，它是 python 版本，我尝试了上述所有命题​​，我将 python 版本从 3 更改为 2，并且它运行良好。

python2 app.py

Answer 12

Extending the @pawelduzy's answer adding a app.run(debug=True) resolved the same issue in my virtual environement where Flask-WTF extension was already installed via pip install flask-wtf .

This is the content of my '__init__.py' file

from flask import Flask
from config import Config

app = Flask(__name__)
app.config.from_object(Config)
app.run(debug=True)

from app import routes

Alternatively you may insert the app.run(debug=True) statement into a .py -file that launches the main application

from app import app
app.run(debug=True)

But be aware of what is mentioned in the Flask's Docs, namely "Debugging Application Errors"

Having problems getting your application configured for production? If you have shell access to your host, verify that you can run your application manually from the shell in the deployment environment. Be sure to run under the same user account as the configured deployment to troubleshoot permission issues. You can use Flask's builtin development server with debug=True on your production host, which is helpful in catching configuration issues, but be sure to do this temporarily in a controlled environment. Do not run in production with debug=True .

Answer 13

Had the same error "ModuleNotFoundError: No module named 'flask_wtf'". This worked for me:

1. Open Anaconda - install flask_wtf in using this command in the Anaconda terminal:

    conda install -c anaconda flask-wtf

2. In Pycharm go to preferences/project/python interpreter. Click the "+" button on the lower left then search for "flask-wtf. Then install the package.

The second step was not possible without the first, since flask-wtf didn't show up in the list of available packages.