使用另一个变量的输出更新一个变量

青葱年少 2年前 python 210

原文标题 ：updating a variable using using the output from another variable

每当完成新计算时，我都会尝试将“next_answer”的值添加到 current_answer，但是当我运行代码时，next_answer 不会添加到 current_answer。我是否错误地定位了“current_answer += next_answer”？请帮我：）

#calculator
#Add
def add(n1, n2):
  return n1 + n2
#subtract
def subtract(n1, n2):
  return n1 - n2

#multiply
def multiply(n1, n2):
  return n1 * n2

#divide
def divide(n1, n2):
  return n1 / n2

operations = {
  "+": add,
  "-": subtract,
  "*":multiply,
  "/":divide,
}

num1 = int(input("What is the first number?: "))


for operation in operations:
  print(operation)
select_operator = input("Which operator do you want? Type +, - * or /")
num2 = int(input("What is the next number?: "))

operation_function = operations[select_operator]
answer = operation_function(num1, num2)
print(f"{num1} {select_operator} {num2} = {answer}")

continue_ = True
while continue_:
  current_answer = answer
  next_calculation = input(f"Type 'y' to continue calculating with                                 
{current_answer} or type 'n' to exit.:")
  if next_calculation == "y":
    select_operator = input("Which operator do you want? Type +, - * or /")
    next_number = int(input("What is the next number?:"))
    operation_function = operations[select_operator]
    next_answer = int(operation_function(current_answer, next_number))
    print(f"{current_answer} {select_operator} {next_number} = {next_answer}")
    current_answer += next_answer
  elif next_calculation == "n":
    continue_ = False
    print("Thanks for using my calculator")

原文链接：https://stackoverflow.com//questions/71476330/updating-a-variable-using-using-the-output-from-another-variable

我来回复

MohamedAly8 评论

请注意，每次执行while循环时，您将current_answer设置为answer，这是第一个答案。因此，您正在覆盖对第一个计算的更新。

见行current_answer = answer。

2年前 0条评论

maya 评论

部分内容已经简化，请酌情参考：

operations = {"+": lambda x, y: x + y, "-": lambda x, y: x - y, "*": lambda x, y: x * y, "/": lambda x, y: x / y}


select_operator = input("Which operator do you want? Type: +, - * or /：")
num1 = int(input("What is the first number?: "))
num2 = int(input("What is the next number?: "))

answer = operations[select_operator](num1, num2)
print(f"{num1} {select_operator} {num2} = {answer}\n")

while True:
    next_calculation = input(f"Type 'y' to continue calculating with {answer} or type 'n' to exit.:")
    if next_calculation == "y":
        preview_answer = answer
        select_operator = input("Which operator do you want? Type: +, - * or /：")
        next_number = int(input("What is the next number?:"))
        answer = operations[select_operator](answer, next_number)
        print(f"{preview_answer} {select_operator} {next_number} = {answer}")
    else:
        print("Thanks for using my calculator")
        exit()
    print()

2年前 0条评论

使用另一个变量的输出更新一个变量

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