After reading title of this post, don’t try to make duplicate first because herewith content may be asked in different way. Btw, I’m very new in python and start learning now for work requirement.
here are my dependencies
virtualenv --version => 15.0.2
pip --version => 19.0.3
flask --version => 1.0.2, Python 2.7.10 (default, Aug 17 2018, 19:45:58)
python --version => 3.7.1
And, here is my source code of
from flask import Flask app = Flask(__name__) @app.route("/") def home(): return "Hello, World!"
Problem is following error encountered when I render like
Traceback (most recent call last): File “main.py”, line 1, in
from flask import Flask ModuleNotFoundError: No module named ‘flask’
But when I render like
FLASK_APP=main.py flask run, it was working. Please let me know how’s difference between
python ... and
pip can for some reason point to system-wide
pip (which on many systems corresponds to Python 2.7). In order to use
pip from the virtualenv, use
python -m pip command. The following command will do the trick:
pip uninstall flask && python -m pip install flask
Another possibility is that you installed flask via
apt and not
pip. Here’s the difference between the two: What is the difference between `sudo apt install python3-flask` and `pip3 install Flask`?
So now the
flask command is available system-wide.
If this is the case, uninstalling flask with
apt and installing it with
pip should do the trick:
sudo apt remove python-flask pip install flask
(this is my guess that the
apt package is called
Answered By – Pavel Vergeev