On Python 3.7 the webserver example code fails due to jinja2 posix path incompatibility

[raz0rsedge1975]

When I try to run example python code on my Pi Zero2, everything runs fine except the examples simple_webserver and graph_webserver. However, the error message on both scripts is the same: Traceback (most recent call last): File "graph_web_server.py", line 10, in <module> import sensor_package.servers as server File "/home/pi/sensor/Python/Raspberry_Pi/sensor_package/servers.py", line 25, in <module> class SimpleWebpageHandler(BaseHTTPRequestHandler): File "/home/pi/sensor/Python/Raspberry_Pi/sensor_package/servers.py", line 42, in SimpleWebpageHandler loader=jinja2.FileSystemLoader(Path(__file__).parent), File "/usr/lib/python3/dist-packages/jinja2/loaders.py", line 163, in __init__ self.searchpath = list(searchpath) TypeError: 'PosixPath' object is not iterable

Is there a knows workaround to solve this issue quickly?

Thanks for your awesome work!

raz0r

[metriful]

Hi. You need to update your jinja2 package. First make a note of the current version in case you need to revert:

1. Do: pip freeze | grep Jinja2 and note the version number displayed (e.g. 1.2.3)
2. Update the package with: pip install -U Jinja2
3. Test the programs to see if they now run OK.

If you get problems, try installing the exact version we use for testing: pip install Jinja2==2.11.3 If the update causes other problems, you can revert to the original version using the same command.

[raz0rsedge1975]

Interestingly enough, this only happened to a fresh install on a pi2zero - thought everything is up-to-date already. pip install -U Jinja2 fixed the problem, thanks for this quick solution.

[metriful]

Great, thanks for the update.