Python趣味挑战之给幼儿园弟弟生成1000道算术题_Python

一、前言

阿姨花了30元给幼儿园的小弟弟买了一本习题，里面都是简单的二元加减法。我一听，惊道：“怎么还花钱买题？我动动手指能给你生成一千条。”

阿姨觉得二元加减太简单了，想要三元加减法的算术题（x + y + z; x + y - z; x - y - z; x - y + z），因为弟弟还小，只会100以内的加减法，不会负数，所以出的算术题不仅计算结果要在[0, 100]内，算式中的任何两位的计算也要在[0, 100]内。

希望弟弟长大后会感谢我，嘻嘻~

二、思路

生成在[1,99]内的随机数x, y, z，若它们的计算结果在[0, 100]内，且算式中的任何两位的计算也在[0, 100]内，就保存在字符串里，作为答案，如"10 + 13 + 9 = 32"；将字符串存入set中，因为Python的set是无序且不重复的，所以它会自动打乱和去重；把答案写入文件，写入文件时要写入index（题号）去掉结果再写入另一个文件，作为题目

三、方法

1.生成随机整数：

import random
x = random.randint(1, 99)	# 生成[1, 99]内的整数

2.set：

s = set()	# 初始化要用set()
x = 1
s.add(x)	# 将x插入s

3.将结果存入文件

text = "Hello world!"
with open(file, 'a') as f:	# 追加文本到文件
	# 每次输入前清空文件
	f.seek(0)
    f.truncate()
	# 将文本写入文件
    f.write(text)

四、代码

import random

def fun1(x, y, z):
    s = str(x) + " + " + str(y) + " + " + str(z) + " = " + str(x + y + z)
    return s

def fun2(x, y, z):
    s = str(x) + " + " + str(y) + " - " + str(z) + " = " + str(x + y - z)
    return s

def fun3(x, y, z):
    s = str(x) + " - " + str(y) + " + " + str(z) + " = " + str(x - y + z)
    return s

def fun4(x, y, z):
    s = str(x) + " - " + str(y) + " - " + str(z) + " = " + str(x - y - z)
    return s

def generate(num):
    s = set()
    while len(s) < num:
        x = random.randint(1, 99)
        y = random.randint(1, 99)
        z = random.randint(1, 99)
        if ((x + y >= 0 and x + y <= 100)
                and (y + z >= 0 and y + z <= 100)
                and (x + z >= 0 and x + z <= 100)
                and (x + y + z >= 0 and x + y + z <= 100)):
            s.add(fun1(x, y, z))
        if ((x + y >= 0 and x + y <= 100)
                and (y - z >= 0 and y - z <= 100)
                and (x - z >= 0 and x - z <= 100)
                and (x + y - z >= 0 and x + y - z <= 100)):
            s.add(fun2(x, y, z))
        if ((x - y >= 0 and x - y <= 100)
                and (- y + z >= 0 and - y + z <= 100)
                and (x + z >= 0 and x + z <= 100)
                and (x - y + z >= 0 and x - y + z <= 100)):
            s.add(fun3(x, y, z))
        if ((x - y >= 0 and x - y <= 100)
                and (- y - z >= 0 and - y - z <= 100)
                and (x - z >= 0 and x - z <= 100)
                and (x - y - z >= 0 and x - y - z <= 100)):
            s.add(fun4(x, y, z))
    return s

def save_in_file(answers, answer_file, question_file):
    with open(answer_file, 'a') as f:
        # 每次输入前清空文件
        f.seek(0)
        f.truncate()

        cnt = 1
        for ans in answers:
            text = str(cnt) + ")  " + ans + '\n'
            f.write(text)
            cnt += 1

    with open(question_file, 'a') as f:
        f.seek(0)
        f.truncate()

        cnt = 1
        for ans in answers:
            ques = str(cnt) + ")  " + ans[: ans.find('=') + 1] + "\n"
            f.write(ques)
            cnt += 1


save_in_file(generate(1000), 
"C:\\Users\\sibyl\\Desktop\\calculation\\answer.txt", 
"C:\\Users\\sibyl\\Desktop\\calculation\\question.txt")