Feature request: clear error message when calculate_wake is forgotten

[Bartdoekemeijer]

Is your feature request related to a problem? Please describe.
Feature request.

Describe the solution you'd like
Requesting a clear error message when the user forgets to call calculate_wake before calling get_farm_power or get_turbine_powers in the FlorisInterface class.

Describe alternatives you've considered
N/A

Additional context
This the current error message the user gets:

Exception has occurred: AttributeError       (note: full exception trace is shown but execution is paused at: <module>)
'Farm' object has no attribute 'turbine_type_map'
  File "/home/bartdoekemeijer/python_scripts/floris/floris/tools/floris_interface.py", line 573, in get_turbine_powers
    turbine_type_map=self.floris.farm.turbine_type_map,
  File "/home/bartdoekemeijer/python_scripts/floris/examples/04_sweep_wind_directions.py", line 61, in <module> (Current frame)
    turbine_powers = fi.get_turbine_powers() / 1E3 # In kW
  File "/usr/lib/python3.9/runpy.py", line 87, in _run_code
    exec(code, run_globals)

Which can take a while to trace back to the actual problem.

[paulf81]

I made #432 to take a pass, what do you think?

[Bartdoekemeijer]

@paulf81 I think that's good! Perhaps check_calc_wake_run can become a private function, _check_calc_wake_run, and we would also need to raise the warning in get_farm_power, and perhaps another couple functions?

[paulf81]

Clicked the wrong button, I'll try that out thanks Bart!

[rafmudaf]

This has been addressed in #432.

Given this script:

from floris.tools import FlorisInterface
fi = FlorisInterface("inputs/gch.yaml")
# fi.calculate_wake()
turbine_powers = fi.get_turbine_powers()

The following error message is given:

>>$ python 01_opening_floris_computing_power.py 
Traceback (most recent call last):
  File "removed /floris/examples/01_opening_floris_computing_power.py", line 9, in <module>
    turbine_powers = fi.get_turbine_powers()
  File "removed /floris/floris/tools/floris_interface.py", line 594, in get_turbine_powers
    raise RuntimeError(
RuntimeError: Can't run function `FlorisInterface.get_turbine_powers` without first running `FlorisInterface.calculate_wake`.