Phonopy cleanup (#2107)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

src/quacc/atoms/phonons.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+from importlib.util import find_spec
 from typing import TYPE_CHECKING
 
 import numpy as np
@@ -10,18 +11,15 @@
 from pymatgen.io.phonopy import get_phonopy_structure, get_pmg_structure
 from pymatgen.symmetry.analyzer import SpacegroupAnalyzer
 
-try:
- import phonopy
+has_phonopy = find_spec("phonopy")
 
- has_phonopy = True
-except ImportError:
- has_phonopy = False
+if has_phonopy:
+ from phonopy import Phonopy
 
 if TYPE_CHECKING:
  from ase.atoms import Atoms
 
- if phonopy:
- from phonopy import Phonopy
+ if has_phonopy:
  from phonopy.structure.atoms import PhonopyAtoms
 
 
@@ -71,7 +69,7 @@ def get_phonopy(
  np.round(np.ceil(min_lengths / np.array(symmetrized_structure.lattice.abc)))
  )
 
- phonon = phonopy.Phonopy(
+ phonon = Phonopy(
  get_phonopy_structure(symmetrized_structure),
  symprec=symprec,
  supercell_matrix=supercell_matrix,