Python 入门编程题（三）答案

曾经终败给现在 2022-04-10 04:14 197阅读 0赞

# Python 入门编程题：21~30（答案） #

提示：最好还是先思考，先编写，再看答案哦 ^\_^

21.

import os.path
    import shutil
    
    def create_filefolder(folder_name):
        if not os.path.exists(folder_name):
            os.mkdir(folder_name)
    
    def main():
        create_filefolder("运行结果")
        file_list = os.listdir('..\\images')
        folders = []
        for each in file_list:
            folders.append(each.split('-')[0])
        folders = set(folders)
        os.chdir("运行结果")
        for folder in folders:
            create_filefolder(folder)
        os.chdir('..\\..\\images')
        for file in file_list:
            shutil.move(file, '..\\py\\运行结果\\'+file.split('-')[0])
            
    if __name__ == '__main__':
        main()

--------------------

22.

改进我们的小红球“”

class Ball:
        def __init__(self,canvas,paddle,color):
            self.canvas = canvas
            self.paddle = paddle
            self.id = canvas.create_oval(10,10,25,25,fill=color)
            self.canvas.move(self.id,245,100)
            starts = [-3,-2,-1,1,2,3]
            random.shuffle(starts)
            self.x = starts[0]
            self.y = -3
            self.canvas_height = self.canvas.winfo_height()
            self.canvas_width = self.canvas.winfo_width()
        def draw(self):
            self.canvas.move(self.id,self.x,self.y)
            pos = self.canvas.coords(self.id)
            if pos[1] <= 0:
                self.y = 3
            if pos[3] >=self.canvas_height:
                self.y = -3
            if self.hit_paddle(pos) == True:
                self.y = -3
            if pos[0] <= 0:
                self.x = 3
            if pos[2] >= self.canvas_width:
                self.x = -3

把小球加入主循环：

while 1:
        ball.draw()
        tk.update_idletasks()
        tk.update()
        time.sleep(0.01)

--------------------

23.

list1 = [1, [2], [3, 4], [[5, 6], 7], [8, [[9, [10], 11], 12], 13]]
    print([int(i.strip(' []')) for i in str(list1).split(',')])

--------------------

24.

def leapyear(year):
        if (year % 4 == 0 and year % 100) or year % 400 == 0:
            return True
        else:
            return False
    
    def days(ymd):
        d =(0,31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30)
        day = sum(d[:ymd[1]]) + ymd[2]
        if leapyear(ymd[0]) and ymd[1] > 2:
            day += 1
        return day
    
    start = (2014, 8, 18)
    now = (2017, 4, 19)
    result = - days(start)
    for i in range(start[0], now[0]):
        if leapyear(i):
            result += 366
        else:
            result += 365
    result = result + days(now)
    print(result)

--------------------

25.

str1 = 'easqWAwaeq'
    str2 = ''.join(sorted(list(str1), key = lambda x: ord(x) if ord(x) < 97 else ord(x) -31.5))
    print(str2)

--------------------

26.

lower = int(input("输入区间最小值: "))
    upper = int(input("输入区间最大值: "))
    
    for num in range(lower,upper + 1):
            # 素数大于 1
            if num > 1:
                    for i in range(2,num):
                            if (num % i) == 0:
                                    break
                    else:
                            print(num)

--------------------

27.

import itertools
    count = 1
    for i in itertools.permutations((1, 2, 3, 4, 6 , 7, 8, 9), 4):
        list1 = [0] * 9
        list1[4] = 5
        if len(set([10 - n for n in i]) & set(i)) == 0:
            for j in range(4):
                list1[j] = i[j]
            for j in range(4):
                list1[8 - j] = 10 - i[j]
            if list1[0] + list1[1] + list1[2] == 15 and list1[0] + list1[3] + list1[6] == 15:
                print('No.%d'%count)
                for m in range(3):
                    print(list1[m * 3: (m + 1) * 3])
                print()
                count += 1

--------------------

28.

for x in range(1,10):
            for y in range(1,10):
                    for z in range(1,10):
                            if x + y + z == 15:
                                    print('%s + %s + %s = 15' % (x,y,z))

--------------------

29.

def fadd(a,b,c,d):
        fenzi = a*d+b*c
        fenmu = b*d
        GCD = lambda x,y:x if y==0 else GCD(y, x%y)
        gcd = GCD(fenzi,fenmu)
        fenzi /= gcd
        fenmu /= gcd
        return fenzi, fenmu
    
    print '1/6 + 1/3 = %d/%d' % fadd(1,6,1,3)
    
    def fminus(a,b,c,d):
        fenzi = a*d-b*c
        fenmu = b*d
        GCD = lambda x,y:x if y==0 else GCD(y, x%y)
        gcd = GCD(fenzi,fenmu)
        fenzi /= gcd
        fenmu /= gcd
        return fenzi, fenmu
    
    print '1/2 - 1/3 = %d/%d' % fminus(1,2,1,3)

--------------------

30.

import random as r
    
    guess = ['石头', '剪刀', '布', '石头']
    player = input(f'{guess[0:3]}：')
    while player != 'Q':
        try:
            if player not in guess:
                raise
            CPU = r.choice(guess[0:3])
            print(f'CPU:{CPU}')
            if player == CPU:
                print('Draw！')
            elif guess[guess.index(player) + 1] == CPU:
                print('Player Win!')
            else:
                print('CPU win！')
            player = input(f'{guess[0:3]}：')
        except:
            player = input(f'输入有误！{guess[0:3]}：')

--------------------

*（未完待续，持续更新）*