我的输入在不应该运行时运行 [英] My input runs when not supposed to

问题描述

我的问题是我试图用文本输出和所有内容制作一个更好，更压缩但仍然更高级的计算器.当我遇到问题时，它还处于非常非常早期的阶段.

my problem here is that I'm trying to make a better, more compressed but still advanced calculator with text outputs and everything. It's still in a very, VERY early stage as I came across a problem.

#!/usr/bin/python
import math
import time
import random
op=input('add/sub/mul/div/sqrt/n!/pow/ctof/hex')
if op==('ctof'):
    choice=input('C to F or F to C. 1 or 2')
    if choice=='1':
        c=float(input('Input Celcius'))
        print(str(c)+' Degrees Celcius = '+str(c*1.8+32)+' Degrees Fahrenheit')
    if choice=='2':
        f=float(input('Input Fahrenheit'))
        print(str(f)+' Degrees Fahrenheit = '+str((f-32)/1.8)+' Degrees Celcius')
    else:
        print('Invalid operation')
if op==('sqrt')or('n!'):
    x=float(input('Input X'))
    if op==('sqrt'):
        print('The square root of '+str(x)+' is: '+str(math.sqrt(x)))
    if op==('n!'):
        print('The factorial of '+str(x)+' is: '+str(math.factorial(x)))
else:
    x=float(input('Input X'))
    y=float(input('Input Y'))
if op==('add'):
    print(str(x)+' + '+str(y)+' = '+str(x+y))

问题是平方根和阶乘条件中的x输入运行，而不是 else: 一.因此，当我使用add时，它说Y丢失了.我在做什么错了，为什么输入错误呢?

The thing is that the x inputin the square root and factorial condition runs instead of the else: one. So when I use add it says that Y is missing. What am I doing wrong and why does the wrong input start.

顺便说一句，对不起，代码混乱.如前所述，我希望它紧凑.另外，我认为亲自查看(如果可行)是一个很好的选择.

By the way, sorry for the messy code. As said I wanted it to be compact. Plus I think It's a beuty to look at personally(if it was working).

推荐答案

所需的比较如下:

if op == 'sqrt' or op == 'n!':

您的代码存在问题

if op == 'sqrt' or 'n!':

是因为'n!'是恒定的真实值，所以它总是求值为true.它不会评估您认为的评估结果，它会执行以下操作:

is that it always evaluates to true because 'n!' is a constant truthy value. It does not evaluate what you think it evaluates, it does something like this:

if (op == 'sqrt') or 'n!':

变成

if (op == 'sqrt') or True:

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