python - 使用列表推导扩展堆栈

Question

如何解释列表理解表达式不起作用（python 3.8.2 32bit env）：

def perfect_squares(max_psqare):
   psqares = [0]
   return [psqares.append(psqares[-1] + 2 * i - 1) for i in range(1, int(max_psqare ** 0.5) + 1)]

对比：

def perfect_squares(max_psqare):
   psqares = [0]
   max_base = int(max_psqare ** 0.5)
   for i in range(1, max_base + 1):
      psqares.append(psqares[-1] + 2 * i - 1)
   return psqares

第一个给出 None 值的数组？理解表达式无权访问 psqares 堆栈？