La PEP 572 : Assignment Expressions is useful in the following examples :

• avoiding inefficient comprehensions

  foo = [y := f(x), y*y, y*y*y]

• unnecessary variables in scope

  for x in data:
      result = f(x)
      if result:
          foo.append(result)
  # Turned into
  results = [ result for x in data if (result := f(x)) ]

• processing streams in chunks

  while chunk := file.read(8192):
  process(chunk)

• Avoiding unecessary lines

  group = match.group(1) if (match := re.match(data)) else None

Avec ces arguments, l'opérateur semble être une bonne amélioration pour le langage