nwis_client: "RuntimeError: There is no current event loop in thread 'MainThread'."

[jarq6c]

When running this code the first time, I get an error.

from hydrotools.nwis_client.iv import IVDataService

obs_client = IVDataService()
gages = obs_client.get(huc="03")

print(gages.head())

Traceback (most recent call last):
  File "main.py", line 44, in <module>
    main()
  File "main.py", line 7, in main
    obs_client = IVDataService()
                 ^^^^^^^^^^^^^^^
  File "/lib/python3.12/site-packages/hydrotools/nwis_client/iv.py", line 112, in __init__
    self._restclient = RestClient(
                       ^^^^^^^^^^^
  File "/lib/python3.12/site-packages/hydrotools/_restclient/_restclient.py", line 91, in __init__
    self._loop = loop or asyncio.get_event_loop()
                         ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/lib/python3.12/asyncio/events.py", line 702, in get_event_loop
    raise RuntimeError('There is no current event loop in thread %r.'
RuntimeError: There is no current event loop in thread 'MainThread'.

Running the code a second time results in normal output.

[aaraney]

Thanks for reporting this, @jarq6c! This might be due to a change in the behavior of asyncio.get_event_loop introduced in python 3.12. I'll take a closer look this afternoon!