To do list

Long term

Inline to do items

Todo

strict=True can be a Python 3 compatible keywords-only argument with the function like:

   def has_vars(self, *keys, strict=True):
       ...
       if strict:
           return keys.issubset(keys_state)
       else:
           return len(keys.intersection(keys_state)) > 0

When ``True``, checks if all keys form a subset of state keys. When
``False``, checks if the intersection of the keys and the state keys
has atleast one member.

(The original entry is located in /home/docs/checkouts/readthedocs.org/user_builds/fluidsim/envs/latest/lib/python3.7/site-packages/fluidsim/base/state.py:docstring of fluidsim.base.state.StateBase.has_vars, line 31.)

Todo

It would be interesting to also implement the Adams-Bashforth (leapfrog) scheme with phase-shifting. It is very close to _time_step_RK2_phaseshift() with 2 evaluations of the non-linear terms per time step (but with 2 symmetrical and equivalent steps).

(The original entry is located in /home/docs/checkouts/readthedocs.org/user_builds/fluidsim/envs/latest/lib/python3.7/site-packages/fluidsim/base/time_stepping/pseudo_spect.py:docstring of fluidsim.base.time_stepping.pseudo_spect, line 10.)