fix: label/name propogation broken passing though histograms (#630)

Fix #549.

---------

Signed-off-by: Henry Schreiner <[email protected]>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: henryiii

src/hist/basehist.py

@@ -127,8 +127,6 @@ def __init__(
         """
         self._hist: Any = None
         self.axes: NamedAxesTuple
-        self.name = name
-        self.label = label
 
         args: tuple[AxisTypes, ...]
 
@@ -179,6 +177,9 @@ def __init__(
         if data is not None:
             self[...] = data
 
+        self.name = name
+        self.label = label
+
     # Backport of storage_type from boost-histogram 1.3.2:
     if not hasattr(bh.Histogram, "storage_type"):
 

tests/test_bh.py

@@ -20,3 +20,12 @@ def test_bh_conversion():
     assert not isinstance(h3.axes[0], hist.axis.Regular)
     assert h2.axes[0].name == "y"
     assert h3.axes[0].metadata == {"name": "x"}
+
+
+def test_bh_conversion_add_metadata():
+    h = bh.Histogram(bh.axis.Regular(3, 2, 1))
+
+    h2 = hist.Hist(h, label="abc", name="def")
+
+    assert h2.label == "abc"
+    assert h2.name == "def"