ImportError: No module named flask

5
votes

I installed virtualenv, activated it, and installed flask. So I have three folders: Include, Scripts and Lib. This last folder contains the site-packages folder, that contains flask folder.

If I put my app.py (simple Hello World app) inside "site-packages" folder, I don't get this error. But if put out of this three folder, but inside my flask_environment, I get this error.

Is something going wrong here?

The error:

Traceback (most recent call last):
  File "C:\Flask\flask_env\app.py", line 3, in <module>
    from flask import Flask
ImportError: No module named flask
5
pythonflaskvirtualenv
So, with your environment activated, you get an error when you execute: python -c 'import flask' Also, can you show a stripped down version of your module that produces this error? - jaime
Are any of your files/folders called flask? If so this may confuse the import call. - Ffisegydd
Ffisegydd, I created a Flask folder to run virtualenv inside and to create flask_env folder - leandrotk
@user3159162 That tells you that flask is installed correctly. You should start the python interpreter and enter your script one line at a time, it should reproduce the error by the time you get to line 3 - jaime
@leandrotk make sure you activate your virtualenv before running the python file. - simanacci

5 Answers

6
votes

Please make sure you have activated virtual environment before running python file.

. venv/bin/activate
3
votes

try this command in the terminal instead of selecting 'run code':

 python3 'insert your file name here without the quotes'
2
votes

check this stack answer, only instead of pika you have to type flask:

python no module name pika when importing pika

2
votes

If you are using python3 you have to change a little bit your wsgi file.

I changed my xx.wsgi from using execfile() to using exec(). Here is what it looks like when it finally worked.

activate_this = '/opt/flask/project_name/py3venv/bin/activate_this.py'
exec(open(activate_this).read(), dict(__file__=activate_this))

import sys
sys.path.insert(0, '/opt/flask/project_name')

from project_app_name import app as application
1
votes

run as python3 <file_name>

EX: python3 api.py