用python写一个单一计算器程序：
print("直接回车可以结束输入")
L=[]
while True:
x = input("请你输入数字：")
if x == "":
break
L.append(int(x))
print(L)
def add():
x=0
for j in L:
x+=j
print(f"数字{L}相加的和是{x}")
def subtract():
x=L[0]
for j in L[1:]:
x-=j
print(f"数字{L}相减的差是{x}")
def multiply():
x=L[0]
for j in L[1:]:
x*=j
print(f"数字{L}相乘的积是{x}")
def divide():
x=L[0]
for j in L[1:]:
x/=j
print(f"数字{L}相除的商是{x}")
fuhao=input("请你选择运算符号 '+ - * /'")
if fuhao == "+":
add()
if fuhao == "-":
subtract()
if fuhao == "*":
multiply()
if fuhao == "/":
divide()