Flask ImportError: No Module Named Flask
I'm following the Flask tutorial here:
I get to the point where I try ./run.py and I get:
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:
But their solutions aren't helpful. For reference, I do have a folder named flask which one user mentioned may cause issues.
try deleting the virtualenv you created. create a new virtualenv
let's activate the virtualenv
now you should see (flask) on the left of the command line. Let's install flask
pip install flask
Then create a file hello.py
from flask import Flask app = Flask(__name__) @app.route("/") def hello(): return "Hello World!" if __name__ == "__main__": app.run()
and run it with
UPDATE Flask 1.0.2
With the new flask release there is no need to run the app from your script. hello.py should look like this now:
from flask import Flask app = Flask(__name__) @app.route("/") def hello(): return "Hello World!"
and run it with
FLASK_APP=hello.py flask run
make sure to be inside the folder where hello.py is when running the latest command.
All the steps before the creation of the hello.py apply for this case as well
For python 3 use
pip3 install flask
The only way I could solve was by adding my users python dir to myapp.wsgi file. As an example:
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.
I had a similar problem with flasgger.
The reason for that was that I always use
sudo pip install flask
but for some reason that's not always the way to go. Sometimes, you have to do just
pip install flask
Another gotcha is that sometimes people type pip install Flask with the cap F
Posting this here in case somebody gets stuck. Let me know if it helped.
I was using python2 but installed this: sudo apt-get install libapache2-mod-wsgi-py3
Instead of: sudo apt-get install libapache2-mod-wsgi
Correcting the installation solved the no flask problem.
- Edit /etc/apache2/sites-available/FlaskApp.conf
- Add the following two lines before the "WSGIScriptAlias" line:
WSGIDaemonProcess FlaskApp python-home=/var/www/FlaskApp/FlaskApp/venv/FlaskApp WSGIProcessGroup FlaskApp
- Restart Apache:service apache2 restart
I'm following the Flask tutorial too.And I met the same problem.I found this way to fix it.
In my case the solution was as simple as starting up my virtual environment like so:
It turns out I am still fresh to Python :)
After activating the virtual environment and installing Flask, I created an app.py file. I run it like this : python -m flask run. Hope this will help!
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.py again from microblog (or from wherever you have the file).
Even i too suggest u virtualenv, This might also solve ur problem.
sudo apt install python-flask
If u want to deploy in productionserver then go ahead with above solution else use virtualenv.
this is what worked for me,
sudo -H pip install flask
Or for pip3(python3) use :
sudo -H pip3 install flask
If you're using virtualenv it's a good idea to pip freeze >> requirements.txt to allow for the installed packages to be listed in one place. The sudo command and -H flag. For more on sudo's -H flag, look at Paul's answer. Hope this helps you.
enter your python interactive mode then:
it will print your path. Check wether flask is installed in the sys.path.
For MacOS, python path is under /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages
But pip'll install python package by default under /Library/Python/2.7/site-packages
That's why it doesn't work for MacOS.
It worked for me after upgrading pip:
curl https://bootstrap.pypa.io/get-pip.py | python
Found that answer here: https://stackoverflow.com/a/49748494/3197202
Then I could just install flask:
pip install flask
This is what worked for me when I got a similar error in Windows; 1. Install virtualenv
pip install virtualenve
Create a virtualenv
Navigate to Scripts and activate the virtualenv
python -m pip install flask
Check if flask is installed
python -m pip list
The flask script is nice to start a local development server, but you would have to restart it manually after each change to your code. That is not very nice and Flask can do better. If you enable debug support the server will reload itself on code changes, and it will also provide you with a helpful debugger if things go wrong. To enable debug mode you can export the FLASK_DEBUG environment variable before running the server: forexample your file is hello.py
$ export FLASK_APP=hello.py $ export FLASK_DEBUG=1 $ flask run