ImportError: No module named flask

Question

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

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, Jun 12 '14 at 15:30
Are any of your files/folders called `flask`? If so this may confuse the import call. — Ffisegydd, Jun 12 '14 at 15:35
Ffisegydd, I created a Flask folder to run virtualenv inside and to create flask_env folder — leandrotk, Jun 12 '14 at 15:38
@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, Jun 12 '14 at 17:55
@leandrotk make sure you activate your virtualenv before running the python file. — simanacci, Jun 16 '16 at 15:21

score 6 · Answer 1 · answered Dec 04 '14 at 21:49

6

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

. venv/bin/activate

answered Dec 04 '14 at 21:49

Dhananjay

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true, was making the same mistake - running it before activating my virtualenv. – simanacci Jun 16 '16 at 15:19
if you are on linux/ubuntu run your virtualenv using `source venv/bin/activate` – HelloBlob Feb 08 '20 at 19:29

score 3 · Answer 2 · answered Dec 16 '19 at 14:00

3

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

 python3 'insert your file name here without the quotes'

answered Dec 16 '19 at 14:00

ablshk

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score 2 · Answer 3 · edited May 23 '17 at 10:27

2

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

python no module name pika when importing pika

edited May 23 '17 at 10:27

Community

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answered Jan 16 '15 at 16:05

Najeebullah Shah

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score 2 · Answer 4 · answered Apr 22 '15 at 19:04

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

score 0 · Answer 5 · answered Feb 08 '20 at 08:43

0

run as python3 <file_name>

EX: python3 api.py

answered Feb 08 '20 at 08:43

F.A. SULAIMAN

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ImportError: No module named flask

5 Answers5

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