QuantityIndex

pintxarray/__init__.py

@@ -1 +1,2 @@
 from .accessors import PintDataArrayAccessor, PintDatasetAccessor
+from .indexing import QuantityIndex

pintxarray/accessors.py

@@ -16,6 +16,7 @@
 if not IS_NEP18_ACTIVE:
     raise ImportError("NUMPY_EXPERIMENTAL_ARRAY_FUNCTION is not enabled")
 
+# TODO do we need this? xarray chooses it's own labels anyway
 try:
     mpl = import_module("matplotlib")
     has_mpl = True

pintxarray/indexing.py

@@ -0,0 +1,29 @@
+import pandas as pd
+from pandas.core.base import IndexOpsMixin
+
+from pint import Quantity, Unit
+
+
+# TODO does pandas supply some kind of abstract base class for indexer objects?
+class QuantityIndex(IndexOpsMixin):
+    def __init__(self, index=pd.Index, units=None, unit_registry=None,
+                 decode_cf=False):
+        self._index = index
+        self._units = units
+
+    @property
+    def units(self):
+        ...
+
+    @property
+    def magnitude(self):
+        ...
+
+    def dequantify(self):
+        ...
+
+    def to(self, units):
+        ...
+
+    def to_base_units(self):
+        ...