Flask ImportError No Module Named Flask

Question

I m following the Flask tutorial here    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   Traceback  most recent call last     File    run py   line 3  in  lt module gt      from app import app   File   Users benjaminclayman Desktop microblog app   init   py   line 1  in  lt module gt      from flask import Flask ImportError  No module named flask   This looks similar to   ImportError  No module named flask  But their solutions aren t helpful   For reference  I do have a folder named flask which one user mentioned may cause issues

User · Answer

For python 3 use     pip3 install flask

User · Answer

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

User · Answer

Try deleting the virtualenv you created   Then create a new virtualenv with  virtualenv flask  Then  cd flask  Now let s activate the virtualenv source bin activate  Now you should see  flask  on the left of the command line  Edit  In windows there is no  quot source quot  that s a linux thing  instead execute the activate bat file  here I do it using Powershell  PS C  DEV aProject gt   amp    Flask Scripts activate   Let s install flask  pip install flask  Then create a file named hello py  NOTE  see UPDATE Flask 1 0 2 below   from flask import Flask app   Flask   name      app route  quot   quot   def hello        return  quot Hello World  quot   if   name       quot   main   quot       app run    and run it with  python hello py  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  quot   quot   def hello        return  quot Hello World  quot   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

User · Answer

In my case the solution was as simple as starting up my virtual environment like so     venv scripts activate  It turns out I am still fresh to Python

User · Answer

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

User · Answer

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

User · Answer

This is what worked for me when I got a similar error in Windows  1  Install virtualenv  pip install virtualenve    Create a virtualenv   virtualenv flask Navigate to Scripts and activate the virtualenv  activate Install Flask  python -m pip install flask Check if flask is installed  python -m pip list

User · Answer

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

User · Answer

Another thing - if you re using python3  make sure you are starting your server with python3 server py  not python server py

User · Answer

If you are using Pycharm then this is the virtual environment issue   So  at the time of creating your Python project you will have to select  Existing interpreter  option -  click  system Interpreter  -  select the correct option for example    AppData Local Programs Python Python3 6 python exe    You can use  New Virtual Env  as well  but I have just given the quick fix that should work for Pycharm users

User · Answer

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

User · Answer

this is what worked for me   sudo -H pip install flask   Or for pip3 python3  use    sudo -H pip3 install flask  Sidenote  If you re using virtualenv it s a good idea to  pip freeze  gt  gt  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

User · Answer

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

User · Answer

in my case using Docker  my  env file was not copied  so the following env vars were not set     env local  FLASK APP src app py  so in my Dockerfile i had to include   FROM deploy as dev COPY env   env   which was referenced in docker-compose yml   env file    env  env local  another thing i had to pay attention to is the path variable to ensure my environment is used  ENV PATH  CONDA DIR envs  my environment name from yml file  bin  CONDA DIR bin  PATH

User · Answer

enter your python interactive mode then   import sys  sys path  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

User · Answer

my answer just for any users that use Visual Studio Flesk Web project    Just Right Click on  Python Environment  and Click to  Add Environment

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

The simplest answer to this problem is specifying the correct path to flask in your environment  Make sure the script you are running knows how to get to the flask installation  Using print sys path  as mentioned above certainly helped to figure out the path s  the script was using

[python] Flask ImportError: No Module Named Flask

Examples related to python

Examples related to flask