fix(io): read LATTICE_PARAMETER blocks consistently in STRU parsers

Three STRU parsers checked for a LATTICE_PARAMETER block but then read
blocks['LATTICE_PARAMETERS'] with an extra S, and treated the list of
lines as a string. Read blocks['LATTICE_PARAMETER'][0].split() to match
the neighboring LATTICE_CONSTANT idiom, so STRU files using
LATTICE_PARAMETER parse instead of raising KeyError.

Closes #7555

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: Critsium-xy

interfaces/ASE_interface/abacuslite/io/generalio.py

@@ -467,7 +467,7 @@ def _trim(line):
                               for line in blocks['LATTICE_VECTORS']]
     elif 'LATTICE_PARAMETER' in blocks:
         stru['lat']['param'] = [float(x)
-                                for x in blocks['LATTICE_PARAMETERS'].split()]
+                                for x in blocks['LATTICE_PARAMETER'][0].split()]
 
     #============ ATOMIC_SPECIES ============
     stru['species'] = [dict(zip(['symbol', 'mass', 'pp_file', 'pp_type'],

interfaces/Multiwfn_interface/molden.py

@@ -841,7 +841,7 @@ def read_stru(fpath):
     if 'LATTICE_VECTORS' in blocks:
         stru['lat']['vec'] = [[float(x) for x in line.split()] for line in blocks['LATTICE_VECTORS']]
     elif 'LATTICE_PARAMETER' in blocks:
-        stru['lat']['param'] = [float(x) for x in blocks['LATTICE_PARAMETERS'].split()]
+        stru['lat']['param'] = [float(x) for x in blocks['LATTICE_PARAMETER'][0].split()]
 
     #============ ATOMIC_SPECIES ============
     stru['species'] = [ dict(zip(['symbol', 'mass', 'pp_file', 'pp_type'], line.split())) for line in blocks['ATOMIC_SPECIES'] ]

python/pyabacus/src/pyabacus/io/stru.py

@@ -134,7 +134,7 @@ def _trim(line):
                               for line in blocks['LATTICE_VECTORS']]
     elif 'LATTICE_PARAMETER' in blocks:
         stru['lat']['param'] = [float(x)
-                                for x in blocks['LATTICE_PARAMETERS'].split()]
+                                for x in blocks['LATTICE_PARAMETER'][0].split()]
 
     #============ ATOMIC_SPECIES ============
     stru['species'] = [_atomic_species_from_file(line)