ImportError: No module named 'flask'

[graham768]

Flask is installed in my virtualenv after running pip install -r requirements.txt as seen below

(venv) $ pip list
click (6.6)
Flask (0.11.1)
itsdangerous (0.24)
Jinja2 (2.8)
MarkupSafe (0.23)
pip (8.1.2)
python-dateutil (2.5.3)
requests (2.10.0)
setuptools (24.3.0)
six (1.10.0)
Werkzeug (0.11.10)
wheel (0.29.0)

yet I get the error

Traceback (most recent call last):
  File "app.py", line 3, in <module>
    from flask import Flask, render_template
ImportError: No module named 'flask'

[danielvinson]

Stackoverflow told me to follow these steps (which worked):

sudo aptitude install python3-setuptools sudo easy_install3 pip sudo pip3.4 install -r requirements.txt

[grahovam]

do pip3 install -r requirements.txt instead

[graham768]

Thank you, that solved it!