when debugging python which error to look at first?
Got this cool pan-tilt hat for my Raspberry-Pi by pimoroni. Comes with some web interface code written in flask. The service starts up, but when I click a direction.
Code:
pi@raspberrypi:~/pantilt-hat/examples/pantiltweb $ sudo python3 pantiltweb.py
* Running on http://0.0.0.0:9595/ (Press CTRL+C to quit)
* Restarting with stat
* Debugger is active!
* Debugger pin code: 333-049-063
127.0.0.1 - - [27/Sep/2019 03:09:43] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [27/Sep/2019 03:09:44] "GET /favicon.ico HTTP/1.1" 404 -
127.0.0.1 - - [27/Sep/2019 03:09:49] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [27/Sep/2019 03:10:19] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [27/Sep/2019 03:10:27] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [27/Sep/2019 03:10:32] "GET / HTTP/1.1" 200 -
127.0.0.1 - - [27/Sep/2019 03:10:37] "GET /api/pan/89 HTTP/1.1" 500 -
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/flask/app.py", line 1997, in __call__
return self.wsgi_app(environ, start_response)
File "/usr/lib/python3/dist-packages/flask/app.py", line 1985, in wsgi_app
response = self.handle_exception(e)
File "/usr/lib/python3/dist-packages/flask/app.py", line 1540, in handle_exception
reraise(exc_type, exc_value, tb)
File "/usr/lib/python3/dist-packages/flask/_compat.py", line 33, in reraise
raise value
File "/usr/lib/python3/dist-packages/flask/app.py", line 1982, in wsgi_app
response = self.full_dispatch_request()
File "/usr/lib/python3/dist-packages/flask/app.py", line 1614, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/usr/lib/python3/dist-packages/flask/app.py", line 1517, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/usr/lib/python3/dist-packages/flask/_compat.py", line 33, in reraise
raise value
File "/usr/lib/python3/dist-packages/flask/app.py", line 1612, in full_dispatch_request
rv = self.dispatch_request()
File "/usr/lib/python3/dist-packages/flask/app.py", line 1598, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/home/pi/pantilt-hat/examples/pantiltweb/pantiltweb.py", line 25, in api
pantilthat.pan(angle)
File "/usr/lib/python3/dist-packages/pantilthat/pantilt.py", line 466, in servo_one
self.setup()
File "/usr/lib/python3/dist-packages/pantilthat/pantilt.py", line 72, in setup
self._i2c = SMBus(1)
FileNotFoundError: [Errno 2] No such file or directory