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Remove slow assertion (#1592)
authorJelle Zijlstra <jelle.zijlstra@gmail.com>
Thu, 13 Aug 2020 02:12:21 +0000 (19:12 -0700)
committerGitHub <noreply@github.com>
Thu, 13 Aug 2020 02:12:21 +0000 (19:12 -0700)
Partial fix for #1581

This assertion produces behavior quadratic in the number of leaves in a line, which is making Black extremely slow on files with very long expressions. On my benchmark file this change makes Black 10x faster.

src/black/__init__.py

index 930f2cb0ae5d5525eb48779b6b1149875b870628..7ce2ac896b31b1ae924e437dbb9ff30b524fcb69 100644 (file)
@@ -4594,8 +4594,6 @@ def append_leaves(new_line: Line, old_line: Line, leaves: List[Leaf]) -> None:
         set(@leaves) is a subset of set(@old_line.leaves).
     """
     for old_leaf in leaves:
         set(@leaves) is a subset of set(@old_line.leaves).
     """
     for old_leaf in leaves:
-        assert old_leaf in old_line.leaves
-
         new_leaf = Leaf(old_leaf.type, old_leaf.value)
         replace_child(old_leaf, new_leaf)
         new_line.append(new_leaf)
         new_leaf = Leaf(old_leaf.type, old_leaf.value)
         replace_child(old_leaf, new_leaf)
         new_line.append(new_leaf)