Format code with yapf, autopep8, isort and black

assignment.py

@@ -1,12 +1,13 @@
+import os
+
 (*FIRST,) = [1, 2, 3]
 (*FIRST,) = [1, 2, 3]
 *FIRST, a, b = [1, 2, 3]
 
-import os
-
 open("foo")
 
+
 def foo(foo=None):
-  if foo is None:
-    foo = []
-  return [*foo]
+    if foo is None:
+        foo = []
+    return [*foo]