Format changes for flake8.

functions/classes.py

@@ -435,8 +435,8 @@ def print_assembly_tree(root, levels=None):
 
     Args:
         root (LegoAssembly): The root of the assembly tree to print.
-        levels (List[bool]): Internally used by recursion to know where to print vertical connection.
-                             Defaults to an empty list.
+        levels (List[bool]): Internally used by recursion to know where 
+            to print vertical connection. Defaults to an empty list.
     """
     if not isinstance(root, LegoAssembly):
         raise TypeError(
@@ -459,6 +459,7 @@ def print_assembly_tree(root, levels=None):
         component_padding = "├── " if i < len(root.components) - 1 else "└── "
         print(f"{connection_padding}{component_padding}{component}")
 
+
 def correct_aggregation_hierarchy(root: LegoAssembly, strict: bool = False):
     """
     Recursively checks whether the aggregation hierarchy from `root` is correct.