python计算器出错，我疯了

Question

我试图用python编写一个程序，使用几个不同的操作进行计算（可能效率非常低，但我离题了）。但是，在运行它时出现了一个错误，我无法理解。我认为这需要定义变量的类型。 课程：

import math
print('Select a number.')
y = input()
print('Select another number.')
x = input()
print('Select what operation you wish to perform. (e for exponentiation, d for division, m for multiplication, a for addition, s for subtraction, mo for modulo, l for log (the base is the first number you entered), r for root)')
z = input()
if z == 'e' or z == 'E':
    print('The answer is ' + y**x)
elif z == 'd' or z == 'D':
    print('The answer is ' + y/z)
elif z == 'm' or z == 'M':
    print('The answer is ' + y*x)
elif z == 'a' or z == 'A':
    print('The answer is ' + y+x)
elif z == 's' or z == 'S':
    print('The answer is ' + y-x)
elif z == 'mo' or z == 'Mo':
    print('The answer is ' + y%x)
elif z == 'l' or z == 'L':
    print('The answer is ' + math.log(x,y))
elif z == 'r' or z == 'R':
    print('The answer is ' + y**(1/x))

shell中显示的错误：

Traceback (most recent call last):
  File "C:/Users/UserNameOmitted/Downloads/Desktop/Python/Calculator.py", line 7, in <module>
    z = input()
  File "<string>", line 1, in <module>
NameError: name 'd' is not defined

Answer 1

您的代码有错误

1. 使用raw\u input（）获取字符串输入，而不是input（）
2. 使用int（raw_input（））接受整数输入，这不是一个错误，但这是一个很好的实践。你知道吗
3. 你试图用字符串除int。你知道吗
4. 您试图连接字符串和整数。你知道吗

你的代码应该是这样的。你知道吗

import math
print('Select a number.')
y = int(raw_input())
print('Select another number.')
x = int(raw_input())
print('Select what operation you wish to perform. (e for exponentiation, d for division, m for multiplication, a for addition, s for subtraction, mo for modulo, l for log (the base is the first number you entered), r for root)')
z = raw_input()
if z == 'e' or z == 'E':
    print('The answer is %d'  %(y**x))
elif z == 'd' or z == 'D':
    print('The answer is %d'  %(y/x))
elif z == 'm' or z == 'M':
    print('The answer is %d'  %(y*x))
elif z == 'a' or z == 'A':
    print('The answer is %d'  %(y+x))
elif z == 's' or z == 'S':
    print('The answer is %d'  %(y-x))
elif z == 'mo' or z == 'Mo':
    print('The answer is %d'  %(y%x))
elif z == 'l' or z == 'L':
    print('The answer is %d'  %(math.log(x,y)))
elif z == 'r' or z == 'R':
    print('The answer is %d'  %(y**(1/x)))