我在python計算器中犯的錯誤

Question

我試圖用python編寫一個程序，它使用幾種不同的操作來計算（可能非常低效，但我離題）。但是，運行時出現了一個我無法弄清的錯誤。我認爲它需要定義一個變量的類型。 程序：

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)) 

，在外殼出現了錯誤：

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

您在這裏有幾個問題：

1. z應該raw_input，不input輸入。
2. 在劃分的情況下，您將劃分y/z而不是y/x。

Answer 2

你要做

z = raw_input() 

而且輸入收益爲int在python2.x。所以使用raw_input來讀爲str然後到處像print('The answer is ' + y**x)分成print('The answer is ' + str(y**x))

Answer 3

你的代碼有錯誤

1. 使用的raw_input（）把字符串輸入，而不是輸入（）
2. 使用int（的raw_input（））取整數輸入，它不是一個錯誤，但它是很好的做法。
3. 你試圖用字符串除int。
4. 您試圖連接字符串和整數。

你的代碼應該是這樣的。

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)))