Question

我是python的新手，正在通过我大学的计算课程学习它。我们的作业是创建这个计算器算法，其算法只接受数字1到99，只接受运算符+， - ，*，/，//，％，**。我目前陷入困境，试图弄清楚如何正确使用我目前在方程式中指定为字符串的运算符。我假设它类似于将一个int字符串更改为整数或浮点数，但这就是我已经得到的结果。完整的代码在下面，所有粗线都是代码中的注释，引用了我们赋值中的步骤。感谢您的任何答案，如果您有任何批评，但是对此感到满意，这只是我在该主题上的第二次任务。

＆＃13;

#Welcome and Rules

print("Welcome to calculator.py")
print("Valid numbers are 1 through 99")
print("Valid operators are +, -, *, /, //, %, **")

#Take in first integer that is between 0 and 100.

firstInt = int ( input ("Enter the first number: "))
    
#Take in an operator to operate on the integers.

opStr = input ("Enter a valid operator: ")

#Take in second integer that is between 0 and 100.

secondInt = int ( input ("Enter the second number: "))
               
#Prints the first error encountered then does not continue execution
#Errors include: values not between 0 and 100, or the operator is not
#of the type: +, -, *, /, //, %, **.                 

if (firstInt <= 1 or firstInt >= 100):
    print ("Your first integer is invalid.")
                 
elif (opStr != "+" or opStr != "-" or opStr != "*" or opStr != "/" or \
    opStr != "//" or opStr != "%" or opStr != "**"):
    print ("You entered an invalid operator.")
                 
elif (secondInt <= 1 or secondInt >= 100):
    print ("Your second integer is invalid.")

#Calculates the answer

answer = (firstInt opStr secondInt)


#Print the answer to screen

else:
    print(answer)

＆＃13;

Answer 1

您可能希望基于运算符执行if-else语句。例如：

if opStr = "+":
    answer = firstInt + secondInt
elif opStr = "-":
    answer = firstInt - secondInt
elif opStr = "*":
    answer = firstInt * secondInt

等...

如果你更进一步，我会建议使用一些函数来重用/简化代码。

Python如何使用在等式中指定为字符串的运算符

1 个答案: