Appease black

flat_tree/__init__.py

@@ -10,6 +10,6 @@ except ImportError:
 
 
 try:
-    __version__ = pkg_resources.get_distribution('flat_tree').version
+    __version__ = pkg_resources.get_distribution("flat_tree").version
 except Exception:
-    __version__ = 'unknown'
+    __version__ = "unknown"

flat_tree/accessor.py

@@ -1,6 +1,6 @@
 """An accessor for navigating flat trees."""
 
-__all__ = ['FlatTreeAccessor']
+__all__ = ["FlatTreeAccessor"]
 
 from typing import List, Optional
 
@@ -155,7 +155,7 @@ class FlatTreeAccessor:
         :param index: The index of the root of the tree
         """
         if index & 1:
-            message = 'Roots only available for tree depth 0'
+            message = "Roots only available for tree depth 0"
             raise ValueError(message)
 
         roots: List[int] = []

flat_tree/iterator.py

@@ -1,6 +1,6 @@
 """Stateful iterator for flat trees."""
 
-__all__ = ['FlatTreeIterator']
+__all__ = ["FlatTreeIterator"]
 
 import attr