Unable to run python file - python-3.x

Question

I have been trying to run a python script, but I keep on getting the following error.
Error:
Traceback (most recent call last):
File "cloud_copasi/background_daemon/cloud_copasi_daemon.py", line 18, in <module>
django.setup()
File "/Users/cloudcopasi/cloud-copasi/venv/lib/python3.8/site-packages/django/__init__.py", line 24, in setup
apps.populate(settings.INSTALLED_APPS)
File "/Users/cloudcopasi/cloud-copasi/venv/lib/python3.8/site-packages/django/apps/registry.py", line 91, in populate
app_config = AppConfig.create(entry)
File "/Users/cloudcopasi/cloud-copasi/venv/lib/python3.8/site-packages/django/apps/config.py", line 90, in create
module = import_module(entry)
File "/Applications/Xcode.app/Contents/Developer/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/importlib/__init__.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
File "<frozen importlib._bootstrap>", line 991, in _find_and_load
File "<frozen importlib._bootstrap>", line 973, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'web_interface'
The script file which I am trying to run (cloud_copasi_daemon) is:
import sys, time
import django
django.setup()
from tools.daemon import Daemon
import tools.background_script
from tools.response import RemoteLoggingResponse
from cloud_copasi import settings
import logging
log=logging.getLogger(__name__)
class MyDaemon(Daemon):
#Set the level we wish to log at. Logs are sent back to the central server
#Choices are all, debug, info, error, none
def __init__(self, *args, **kwargs):
return super(MyDaemon, self).__init__(*args, **kwargs)
def stop(self, *args, **kwargs):
return super(MyDaemon, self).stop(*args, **kwargs)
def run(self):
log.debug('Daemon running')
while True:
min_repeat_time = settings.DAEMON_POLL_TYME #Seconds
start_time = time.time()
try:
tools.background_script.run()
log.debug('Background script finished')
except Exception as e:
log.exception(e)
finish_time = time.time()
difference = finish_time - start_time
if difference < min_repeat_time:
time.sleep(min_repeat_time - difference)
if __name__ == "__main__":
daemon = MyDaemon('/tmp/Cloud-COPASI.pid')
if len(sys.argv) == 2:
if 'start' == sys.argv[1]:
daemon.start()
elif 'stop' == sys.argv[1]:
daemon.stop()
elif 'restart' == sys.argv[1]:
daemon.restart()
else:
print ("Unknown command")
sys.exit(2)
sys.exit(0)
else:
print("usage: %s start|stop|restart" % sys.argv[0])
sys.exit(2)
"web_interface" is the Django App and I have verified that the path referring to it is correct. I don't know where else do I need to fix the file path to get this python script to work.
I am having the same problem on Mac OS Big Sur (running Python 3.8) as well as on Linux CentOS (running Python 3.6).
Any help is much appreciated.

Answer 1

When you are trying to bootstrap django like this you need to make sure to set the environment variable PYTHONPATH to include the folder where web_interface lives. I'm guessing that your cloud_copasi_daemon.py is in a different folder than web_interface so when you run python cloud_copasi_daemon.py it looks in the immediate folder in which you invoked the script and can't find it.