Add per-Index data format

src/ansys/dpf/post/index.py

@@ -38,6 +38,20 @@ class ref_labels:
     dpf.locations.time_freq: ref_labels.set_ids,
 }
 
+label_default_format = {
+    ref_labels.results: ":.3e",
+    ref_labels.time: ":.3e",
+    ref_labels.modes: ":.0f",
+    ref_labels.set_ids: ":.0f",
+    ref_labels.step: ":.0f",
+    ref_labels.components: "",
+    ref_labels.element_ids: ":.0f",
+    ref_labels.node_ids: ":.0f",
+    ref_labels.elemental_nodal: ":.0f",
+    ref_labels.frequencies: ":.3e",
+    ref_labels.overall: "",
+}
+
 
 class Index(ABC):
     """A Pandas style API to manipulate indexes."""
@@ -47,6 +61,7 @@ def __init__(
         name: str,
         values: Union[List, None] = None,
         scoping: Union[dpf.Scoping, None] = None,
+        fmt: str = None,
     ):
         """Creates an Index object to use in a DataFrame.
 
@@ -58,13 +73,18 @@ def __init__(
             Values taken by the Index.
         scoping:
             Scoping corresponding to this index to keep a weak reference.
+        fmt:
+            Data string formatting for this index.
         """
         self._name = name.replace(" ", "_")
         self._values = values
         self._dtype = None
         self._len = None
         self._scoping_ref = None
-        self._data_fmt = None
+        if fmt:
+            self._data_fmt = fmt
+        else:
+            self._data_fmt = label_default_format[self._name]
         # if scoping is None and values is None:
         #     raise ValueError("Arguments 'values' and 'scoping' cannot both be None.")
         if scoping is not None: