I have created a python web app with this directory structure:
# cd /usr/local/www/myapp
modules
layout
__init__.py
layout.py
packages
public
myapp.wsgi
I have set my PYTHONPATH to:
/usr/local/www/myapp/modules:/usr/local/www/myapp/packages
In myapp.wsgi I try to do:
import layout
But I am getting Internal server error. Why?
This is my myapp.wsgi (if I remove the import layout line, it works):
import sys
import wsgiref
import layout
def application(environ, start_response):
response_status = '200 OK'
response_body = 'Hello! '
response_headers = []
content_type = ('Content-type', 'text-plain')
content_length = ('Content-Length', str(len(response_body)))
response_headers.append(content_type)
response_headers.append(content_length)
start_response(response_status, response_headers)
return [response_body]
Full error message I am getting:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, [email protected] and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
My virtualhost configuration:
<VirtualHost *:80>
ServerName localhost
ServerAlias localhost
ServerAdmin [email protected]
DocumentRoot /usr/local/www/myapp/public
<Directory /usr/local/www/myapp/public>
Order allow,deny
Allow from all
</Directory>
WSGIScriptAlias / /usr/local/www/myapp/myapp.wsgi
<Directory /usr/local/www/myapp>
Order allow,deny
Allow from all
</Directory>
</VirtualHost>
Error from /var/log/httpd-error.log:
[Fri Jan 20 15:31:03 2012] [error] [client 192.168.201.123] mod_wsgi (pid=1725): Target WSGI script '/usr/local/www/myapp/myapp.wsgi' cannot be loaded as Python module.
[Fri Jan 20 15:31:03 2012] [error] [client 192.168.201.123] mod_wsgi (pid=1725): Exception occurred processing WSGI script '/usr/local/www/myapp/myapp.wsgi'.
[Fri Jan 20 15:31:03 2012] [error] [client 192.168.201.123] Traceback (most recent call last):
[Fri Jan 20 15:31:03 2012] [error] [client 192.168.201.123] File "/usr/local/www/myapp/myapp.wsgi", line 3, in <module>
[Fri Jan 20 15:31:03 2012] [error] [client 192.168.201.123] import layout
[Fri Jan 20 15:31:03 2012] [error] [client 192.168.201.123] ImportError: No module named layout
Output of print sys.path:
This is caused by the fact that the version of Python you're running your script with is not configured to search for modules where you've installed them. This happens when you use the wrong installation of pip to install packages.
A file is considered as a module in python. To use the module, you have to import it using the import keyword. The function or variables present inside the file can be used in another file by importing the module. This functionality is available in other languages, like typescript, JavaScript, java, ruby, etc.
First try:
python /usr/local/www/myapp/myapp.wsgi
Does it load correctly?
If yes, then probably you have some environment (in ~/.bashrc
or such) which is needed for your app. Try::
# to wipe-out extra env
env -i bash
# try again
python /usr/local/www/myapp/myapp.wsgi
Verify you use same python in your shell as the one used by apache WSGI.
If your myapp.wsgi
need any extra env to load correctly, then you can do one of:
To set in in your WSGI code, here is the example code.
import os, sys
EXTRA_DIR = os.path.realpath(os.path.join(os.path.dirname(__file__), '..', '..'))
if EXTRA_DIR not in sys.path:
sys.path.append(EXTRA_DIR)
Put in in the beginning of your myapp.wsgi file.
You have __init.__py
in your layout
folder, but it should be __init__.py
. The period is misplaced. I am not sure if this is a typo in your post or not, but if that's what your file looks like it would cause this problem.
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