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)