Phonon convenience imports (materialsproject#3544)

* add pymatgen/phonon/__init__.py convenience imports

* test_convenience_imports()

pymatgen/phonon/__init__.py

@@ -1 +1,21 @@
-"""Phonon DOS and bandstructure analysis package."""
+"""pymatgen phonon package with functionality for phonon DOS + bandstructure analysis and more."""
+
+from __future__ import annotations
+
+from pymatgen.phonon.bandstructure import PhononBandStructure, PhononBandStructureSymmLine
+from pymatgen.phonon.dos import CompletePhononDos, PhononDos
+from pymatgen.phonon.gruneisen import (
+    GruneisenParameter,
+    GruneisenPhononBandStructure,
+    GruneisenPhononBandStructureSymmLine,
+)
+from pymatgen.phonon.ir_spectra import IRDielectricTensor
+from pymatgen.phonon.plotter import (
+    GruneisenPhononBSPlotter,
+    GruneisenPlotter,
+    PhononBSPlotter,
+    PhononDosPlotter,
+    ThermoPlotter,
+    plot_brillouin_zone,
+)
+from pymatgen.phonon.thermal_displacements import ThermalDisplacementMatrices

tests/phonon/test_init.py

@@ -0,0 +1,21 @@
+from __future__ import annotations
+
+import pymatgen.phonon as ph
+import pymatgen.phonon.bandstructure as bs
+import pymatgen.phonon.dos as dos
+import pymatgen.phonon.gruneisen as gru
+import pymatgen.phonon.plotter as plotter
+
+
+def test_convenience_imports():
+    assert ph.PhononBandStructure == bs.PhononBandStructure
+    assert ph.PhononBandStructureSymmLine == bs.PhononBandStructureSymmLine
+    assert ph.PhononDos == dos.PhononDos
+    assert ph.CompletePhononDos == dos.CompletePhononDos
+    assert ph.GruneisenParameter == gru.GruneisenParameter
+    assert ph.GruneisenPhononBandStructure == gru.GruneisenPhononBandStructure
+    assert ph.GruneisenPhononBandStructureSymmLine == gru.GruneisenPhononBandStructureSymmLine
+    assert ph.PhononDosPlotter == plotter.PhononDosPlotter
+    assert ph.PhononBSPlotter == plotter.PhononBSPlotter
+    assert ph.GruneisenPlotter == plotter.GruneisenPlotter
+    assert ph.GruneisenPhononBSPlotter == plotter.GruneisenPhononBSPlotter