python如何通过闭包实现计算器的功能

def scope(func):
  def calc(a, b):
    try:
      _a = float(a)
      _b = float(b)
    except:
      _a = 0
      _b = 0
    return func(_a, _b)
  return calc


@scope
def add(a, b):
  return a + b


@scope
def sub(a, b):
  return a - b


@scope
def mul(a, b):
  return a * b


@scope
def div(a, b):
  try:
    return a / b
  except ZeroDivisionError as error:
    print(error)
    return 0


# 调用闭包函数
res = scope(add)("1", 3)
print(res)

res = add("1", "2")
print(res)

res = sub("1", "2")
print(res)

res = mul("1", "2")
print(res)

res = div("1", "2")
print(res)