uwsgi + Flask + virtualenv ImportError: no module named site

Question

(Other posts on SO are similar, but none have the specific combination of uwsgi + Flask + virtualenv) (This one is closest)

I installed uwsgi via apt-get. I also tried pip install wsgi. Both gave me the same issue.

Test command:

sudo uwsgi -s /tmp/uwsgi.sock -w myapp:app -H myvirtualenv

Result:

Python version: 2.7.4 (default, Apr 19, 2013, 18:35:44)  [GCC 4.7.3]
Set PythonHome to myvirtualenv
ImportError: No module named site

I can otherwise run my app in the virtual env.

Answer 1

The path to your virtual environment is wrong. That's the reason for this error.

I'm using virtualenvwrapper and my virtual environments are set at ~/.virtualenvs. So in my case, the uwsgi call would look something like

sudo uwsgi -s /tmp/uwsgi.sock -w myapp:app -H ~/.virtualenvs/myapp

Hope this helps next time someone comes looking for this one.

Thanks to Cody for pointing it out in the comments.

Answer 2

See the answer from @JRajan first.

If you're sure you just want to suppress the error and not actually solve the underlying issue, you should add --no-site to your command or no-site=true to your uwsgi.ini file.

Answer 3

In my case the problem was the python version uWSGI tried to use.

My project was written in python 3.4, but I was not specifying this in uWSGI config. So uWSGI tried to use python 2 and tried to import modules from the folder lib/python2.7 inside the virtualenv.

So I received the 'No module named site' error, because all the modules, including the site module, where inside lib/python3.4, not lib/python2.7.

To solve it, i had to do two things:

• Install the python3 plugin for uWSGI, with:
  apt-get install uwsgi-plugin-python3

• Use it in the .ini config file, with:
  plugins = python34

Hope this helps someone with the same problem in the future.

As requested, here follows my .ini file:

[uwsgi]
base = /your/app/path

pythonpath = %(base)
module = your_module_name

callable = app #Here you put the name of the variable which holds your app inside your module

home = /your/virtualenv/path
plugins = python34

master = true
processes = 2

uid = www-data
gid = www-data

socket = /path/to/socket
chmod-socket = 660

die-on-term = true

logto = /var/log/uwsgi/%n.log

Answer 4

I had the similar issue before. My problem is that I have both python2.x and python3.x on my ubuntu system, and I want my project to run in a virtual env in which python3 environment is installed. How I resolved this issue:

apt-get install python3-pip

pip3 install uWSGI

That's all.

Answer 5

If your virtual environment is running on Python3 then you must install uwsgi using pip3, not pip otherwise, version mismatch will create this import problem

pip uninstall uwsgi    
pip3 install uwsgi