Flask在虚拟环境中不起作用

Question

I have installed venv

sudo pip3 install virtualenv

I have activated it

source venv/bin/activate

I have installed Flask, while it was activated

sudo pip3 install Flask

But it doesn't work as soon as I run python3 and then use

import flask

Error:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named 'flask'

Answer 1

Try displaying the list of the installed packages in the virtual environment. After switching to virtual environment using source venv/bin/activate run the command which python it will display the current python in use if the path points to the directory where the virtual environment is placed then it means its running fine. After this try running pip list to display the list of installed packages in the virtual environment. It will tell you whether flask is installed and placed inside the current environment or not.

Answer 2

Try from flask import Flask . It's should help