Use JSON structure

quantum_espresso_workflow.py

@@ -6,6 +6,7 @@
 from ase.io import write
 from adis_tools.parsers import parse_pw
 import matplotlib.pyplot as plt
+import numpy as np
 
 
 def write_input(input_dict, working_directory="."):
@@ -57,7 +58,7 @@ def generate_structures(structure, strain_lst):
             structure_strain.cell * strain ** (1 / 3), scale_atoms=True
         )
         structure_lst.append(structure_strain)
-    return {str(i): s.todict() for i, s in enumerate(structure_lst)}
+    return {str(i): atoms_to_json_dict(atoms=s) for i, s in enumerate(structure_lst)}
 
 
 def plot_energy_volume_curve(volume_lst, energy_lst):
@@ -67,9 +68,46 @@ def plot_energy_volume_curve(volume_lst, energy_lst):
     plt.savefig("evcurve.png")
 
 
-def get_bulk_structure(name, a, cubic):
-    return bulk(
-        name=name,
+def get_bulk_structure(element, a, cubic):
+    ase_atoms = bulk(
+        name=element,
         a=a,
         cubic=cubic,
-    ).todict()
+    )
+    return atoms_to_json_dict(atoms=ase_atoms)
+
+
+def atoms_to_json_dict(atoms):
+    """
+    Convert an ASE Atoms object to a fully JSON-serializable dictionary
+    that uses only Python base data types.
+
+    Parameters:
+    -----------
+    atoms : ase.Atoms
+        The Atoms object to convert
+
+    Returns:
+    --------
+    dict
+        A dictionary representation using only Python base types
+    """
+    # Get the dictionary representation from ASE
+    atoms_dict = atoms.todict()
+
+    # Create a new dictionary with JSON-serializable values
+    json_dict = {}
+
+    # Convert numpy arrays to lists
+    for key, value in atoms_dict.items():
+        if isinstance(value, np.ndarray):
+            # Convert numpy boolean values to Python booleans
+            if value.dtype == np.bool_ or value.dtype == bool:
+                json_dict[key] = value.tolist()
+            # Convert numpy arrays of numbers to Python lists
+            else:
+                json_dict[key] = value.tolist()
+        else:
+            json_dict[key] = value
+
+    return json_dict

workflow_qe.json

@@ -34,7 +34,7 @@
     "31": "python_workflow_definition.pyiron_base.get_list"
   },
   "edges": [
-    {"target": 0, "targetHandle": "name", "source": 9, "sourceHandle": null},
+    {"target": 0, "targetHandle": "element", "source": 9, "sourceHandle": null},
     {"target": 0, "targetHandle": "a", "source": 10, "sourceHandle": null},
     {"target": 0, "targetHandle": "cubic", "source": 11, "sourceHandle": null},
     {"target": 1, "targetHandle": "working_directory", "source": 12, "sourceHandle": null},