python - 我的 Python 3 文件代码没有附加或读取文件的权利

Question

我编写了一个运行良好的计算器代码，但我需要将结果附加到文本文件和/或从文本文件中读取。我已经完成了大部分工作，但我遇到了一些需要帮助的错误 - 当我追加结果时，它只打印“5.098.042.0 ...”并且应该像这样打印

“5 + 3 = 8

7 * 3 =43..." 它确实在代码中显示了它，但由于某种原因它只是在文本中打印结果 请帮忙，任何关于在未来节省工作的建议或任何事情都将不胜感激，谢谢!

    def menu():
            print("\t1. Addition")
            print("\t2. Substraction")
            print("\t3. Multiplication")
            print("\t4. Division")
            print("\t5. Show")
            print("\t6. Quit")


    def option(min, max, exi):
            option= -1

            menu() 
            option= int(input("\n\t-> What would you like to calculate?: ")) 
            while (option < min) or (option > max):
                    print("\n\t>>> Error. Invalid option.")
                    menu() 
                    option= int(input("\n\t-> What would you like to calculate?: ")) 

            return option


    def add():
            num1 = float(input("\tEnter a number: "))
            num2 = float(input("\tEnter a number: "))

            answer = num1 + num2
            print("\n\t-> The result of " + str(num1) + " + " + str(num2) + "= ", answer)
            return answer


    def subs():
            num1 = float(input("\tEnter a number: "))
            num2 = float(input("\tEnter a number: "))

            answer = num1 - num2


            print("\n\t-> The result of " + str(num1) + " - " + str(num2) + "= ", answer)
            return answer


    def mult():
            num1 = float(input("\tFirst number: "))
            num2 = float(input("\tSecond number: "))

            answer = num1 * num2

            print("\n\t-> The result of " + str(num1) + " * " + str(num2) + "= ", answer)
            return answer

    def div():
            num1 = float(input("\tFirst number: "))
            num2 = float(input("\tSecond number: "))

            if num2 != 0:
                    answer = num1 / num2

                    print("\n\t-> The result of " + str(num1) + " / " + str(num2) + "= ", answer)
            else:
                    print("\n\t>>> Error. Division by zero.")
                    answer= "Error. Division by zero."

            return answer


    def result(r):  
            print("\n\t The last result was" , r)


    def ex():
            print("Goodbye")

    def main():
        solution = 0
        op= -1

        while op != 6:
                op = option(0, 6, 0)    
                if op == 1:
                        solution = str(add())
                        with open ("myResultt.txt","a") as f:
                            f.write(solution)

                elif op == 2:
                        solution = str(subs())
                        with open ("myResultt.txt","a") as f:
                            f.write(solution)       
                elif op == 3:
                        solution = str(mult())
                        with open ("myResultt.txt","a") as f:
                            f.write(solution)   
                elif op == 4:
                        solution = str(div())
                        with open ("myResultt.txt","a") as f:
                            f.write(solution)
                elif op == 5:
                        with open ("myResultt.txt","r") as f:
                            for line in f:
                                    print(line)
                else:
                    solution = ex()
                    with open ("myResultt.txt","r") as f:
                            f.close()

    main()

Answer 1

您提示输入 sum 等函数中的操作数。如果您希望这些操作数出现在结果文件中，您要么必须将它们与答案一起返回，要么在函数本身中进行写入。例如，

def add():
    num1 = float(input("\tEnter a number: "))
    num2 = float(input("\tEnter a number: "))

    answer = num1 + num2
    result = "{} + {} = {}".format(num1, num2, answer)
    print("\n\t-> The result of " + result)
    with open ("myResultt.txt","a") as f:
        f.write(result + "\n")
    return answer