pybamm fails when running script a second time in spyder on windows

[TomTranter]

Describe the bug
Running any script more than once seems to result in an import error because of the recent changes to parameters

File "", line 908, in _find_spec

AttributeError: 'ImportDenier' object has no attribute 'find_spec'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

File "C:\Users\tom\code\PyBaMM\examples\scripts\drive_cycle.py", line 14, in
param = model.default_parameter_values

File "c:\users\tom\code\pybamm\pybamm\models\full_battery_models\base_battery_model.py", line 346, in default_parameter_values
return pybamm.ParameterValues(chemistry=pybamm.parameter_sets.Marquis2019)

File "c:\users\tom\code\pybamm\pybamm\parameters\parameter_values.py", line 73, in init
self.update_from_chemistry(chemistry)

File "c:\users\tom\code\pybamm\pybamm\parameters\parameter_values.py", line 216, in update_from_chemistry
self.update(

File "c:\users\tom\code\pybamm\pybamm\parameters\parameter_values.py", line 301, in update
loaded_value = pybamm.load_function(os.path.join(path, value[10:]))

File "c:\users\tom\code\pybamm\pybamm\util.py", line 273, in load_function
module_object = importlib.import_module(path)

File "C:\Users\tom\anaconda3\lib\importlib_init_.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)

File "", line 1014, in _gcd_import

File "", line 991, in _find_and_load

File "", line 961, in _find_and_load_unlocked

File "", line 219, in _call_with_frames_removed

File "", line 1014, in _gcd_import

File "", line 991, in _find_and_load

File "", line 971, in _find_and_load_unlocked

File "", line 910, in _find_spec

File "", line 884, in _find_spec_legacy

File "C:\Users\tom\anaconda3\lib\site-packages\IPython\external\qt_loaders.py", line 48, in find_module
if path:

File "", line 1183, in len

File "", line 1162, in _recalculate

File "", line 1158, in _get_parent_path

KeyError: 'pybamm.input.parameters.lithium_ion'

[tlestang]

Is this maybe related to #1475 ? @priyanshuone6 any ideas what is going wrong?

[tlestang]

@TomTranter Could you provide a minimal example and steps to reproduce please?

[priyanshuone6]

I could dig deeper after I get the steps to reproduce this bug

[TomTranter]

I'm using spyder on windows - running any script twice without restarting the kernel results in the above error. Still happening - any ideas?

[TomTranter]

Seems to be ok when I run example scripts from the pybamm directory but not scripts from another folder

[TomTranter]

Think I fixed it by putting empty init files into all the parameter subfolders