如何使用随机运算符在Python上进行计算 [英] How to do a calculation on Python with a random operator

问题描述

我正在做一个数学测试，其中每个问题将是随机选择的数字相加，相乘或相减.我的运算符将被随机选择，但是我无法确定如何与运算符进行计算.我的问题在这里:

I am making a maths test where each question will be either adding, multiplying or subtracting randomly chosen numbers. My operator will be chosen at random, however I cannot work out how to calculate with the operator. My problem is here:

answer = input()
if answer ==(number1,operator,number2):
    print('Correct')

如何进行计算，以便在计算中使用运算符.例如，如果随机数是2和5，并且随机运算符是'+'，那么我将如何编码我的程序，使其最终实际进行计算并得到答案，因此在这种情况下为:

How can I make it so the operator is used in a calculation. For example, if the random numbers were two and five, and the random operator was '+', how would I code my program so that it would end up actually doing the calculation and getting an answer, so in this case it would be:

answer =input()
if answer == 10:
    print('Correct')

基本上，如何进行计算以检查答案是否正确? 我的完整代码如下.

Basically, how can I do a calculation to check to see if the answer is actually correct? My full code is below.

import random
score = 0 #score of user
questions = 0 #number of questions asked
operator = ["+","-","*"]
number1 = random.randint(1,20)
number2 = random.randint(1,20)
print("You have now reached the next level!This is a test of your addition and subtraction")
print("You will now be asked ten random questions")
while questions<10: #while I have asked less than ten questions
    operator = random.choice(operator)
    question = '{} {} {}'.format(number1, operator, number2)
    print("What is " + str(number1) +str(operator) +str(number2), "?")
    answer = input()
    if answer ==(number1,operator,number2): 
        print("You are correct")
        score =score+1
    else:
        print("incorrect")

对不起，如果我不清楚，请提前感谢

Sorry if I have been unclear, thanks in advance

推荐答案

在字典中使用函数:

operator_functions = {
    '+': lambda a, b: a + b, 
    '-': lambda a, b: a - b,
    '*': lambda a, b: a * b, 
    '/': lambda a, b: a / b,
}

现在您可以将字符串中的运算符映射到函数:

Now you can map an operator in a string to a function:

operator_functions[operator](number1, number2)

为此甚至还有现成的功能是 operator模块:

There are even ready-made functions for this is the operator module:

import operator

operator_functions = {
    '+': operator.add, 
    '-': operator.sub,
    '*': operator.mul,
    '/': operator.truediv,
}

请注意，您在使用变量名时必须小心！您首先使用operator创建了一个运算符列表，然后还使用它来存储您用random.choice()选择的一个运算符，替换该列表:

Note that you need to be careful about using variable names! You used operator first to create a list of operators, then also use it to store the one operator you picked with random.choice(), replacing the list:

operator = random.choice(operator)

在此处使用单独的名称:

operators = ["+","-","*"]

# ...

picked_operator = random.choice(operators)

这篇关于如何使用随机运算符在Python上进行计算的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！