Make @validate_quantities compatible with from __future__ import annotations

[namurphy]

Currently, @validate_quantities does not work in files when there is a from __future__ import annotations statement which postpones the evaluation of annotations. The purpose of this PR is to change that.

With postponed evaluation of annotations, the annotations become strings. For @particle_input, we were able to fix this by using typing.get_type_hints.

I'm starting with a failing test to get a better idea of where this goes wrong.

Closes #2492. Similar to #2479.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.42%. Comparing base (48750b0) to head (3a4e204).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2506   +/-   ##
=======================================
  Coverage   94.42%   94.42%           
=======================================
  Files         107      107           
  Lines        9496     9496           
  Branches     2189     2189           
=======================================
  Hits         8967     8967           
  Misses        342      342           
  Partials      187      187           

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[namurphy]

It turns out this is more difficult than @particle_input and I'm not sure yet how to fix this. Hm...

[JaydenR2305]

PlasmaPy/src/plasmapy/utils/decorators/validators.py

Lines 165 to 185 in 48750b0

	def __call__(self, f):
	"""
	Decorate a function.
	Parameters
	----------
	f
	Function to be wrapped
	Returns
	-------
	function
	wrapped function of ``f``
	"""
	self.f = f
	wrapped_sign = inspect.signature(f)
	@preserve_signature
	@functools.wraps(f)
	def wrapper(*args, **kwargs):
	# combine args and kwargs into dictionary

I think wrapped_sign = inspect.signature(f) -> wrapped_sign = inspect.signature(f, eval_string=True) does the trick :) @namurphy

[namurphy]

I think wrapped_sign = inspect.signature(f) -> wrapped_sign = inspect.signature(f, eval_string=True) does the trick :) @namurphy

@JaydenR2305 — Great job figuring this out! I had been pretty lost on how to address this, so thank you! I made sure to include you as a co-author on the commit.