Python 入门编程题（二）答案

心已赠人 2022-04-04 11:51 240阅读 0赞

# Python 入门编程题：11~20（答案） #

提示：最好还是先思考，先编写，再看答案哦 ^\_^

11.

X = [[12,7,3],
        [4,5,6],
        [7,8,9]]
    
    Y = [[5,8,1],
        [6,7,3],
        [4,5,9]]
    
    result = [[0,0,0],
             [0,0,0],
             [0,0,0]]
    
    # 迭代输出行
    for i in range(len(X)):
       # 迭代输出列
       for j in range(len(X[0])):
           result[i][j] = X[i][j] + Y[i][j]
    
    for r in result:
       print(r)

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

12.

def inp(numbers):
        for i in range(9):
            numbers.append(int(input('input a number:')))
        numbers.append(int(input('input a number:')))
    p = 0
    def max_min(array):
        max = min = 0
        for i in range(1,len(array) - 1):
            p = i
            if array[p] > array[max] : max = p
            elif array[p] < array[min] : min = p
        k = max
        l = min
        array[0],array[l] = array[l],array[0]
        array[9],array[k] = array[k],array[9]
    
    def outp(numbers):
        for i in range(len(numbers)):
            print(numbers[i])
    
    if __name__ == '__main__':
        array = []
        inp(array)
        max_min(array)
        outp(array)

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

13.

import random,time
    time1=time.time()
    n=50
    k=20000000
    c=[]
    #c=[1,2,3,4,5]
    for i in range(n):
        c.append(random.randint(1,100))    
    cs=[1 if i==0 else 0 for i in range(n+1)]
    ta=[]
    for j in range(n+1):
        for i in range(n-j):
            cs[i+1]+=cs[i]
        ta.append(cs[-1])
        del cs[-1]
    ta[0]+=ta[-1]
    del ta[-1]   
    k_n=k//n
    kn=k%n
    for i in range(k_n):
        cc=c.copy()
        for j in range(n):
            xx=0
            for k in range(n):
                xx=xx+(cc[k]*ta[k])%100
            c[j]=xx%100
            cc=cc[1:]+cc[:1]
    
    for i in range(kn):
        c.append(c[0])
        for j in range(n):
            c[j]=(c[j]+c[j+1])%100
        del c[-1]
    print(c,time.time()-time1)

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

14.

num = int(input('多少人围成一圈：'))
    list1 = list(range(1, num + 1))
    n = 2 % len(list1)
    while len(list1) > 1:
        list1.pop(n)
        n = (n + 2) % len(list1)
    print('最后留下的是原来第%d号'%list1[0])

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

15.

def even_sum(n):
    	s1 = 0
    	for i in range(2, n+1, 2):
    		s1 += 1.0 / i
    	return s1
    
    def odd_sum(n):
    	s2 = 0
    	for i in range(1, n+1, 2):
    		s2  += 1.0 / i
    	return s2
    
    def my_sum(n):
    	if n % 2 == 0:
    		s = even_sum(n)
    	else :
    		s = odd_sum(n)
    	return s
    if __name__ == '__main__':
        n = int(input('input a number:\n'))
        sum = my_sum(n)
        print(sum)

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

16.

monkey=1#要分桃的猴子数
    peaches=1#桃的总数
    peach=1#每次分桃的总数
    
    while(monkey<=5):
            #如果成功分桃子
            if peach % 5 ==1 and peach // 5 != 0:
                    #可分桃的总数为现在的4/5
                    peach=(peach // 5)*4
                    # 换下一个猴子
                    monkey += 1
            # 如果失败，重新分桃这时可分桃数量加1
            else:
                    peaches += 1
                    peach = peaches
                    monkey = 1
    print("桃的最小总数为：%s" %peaches)

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

17.

def calc(list1):
            min = abs(list1[0] - list1[1])
            for i in range(len(list1)):
                    for j in range(i+1, len(list1)):
                            if abs(list1[i] - list1[j]) < min:
                                    min = abs(list1[i] - list1[j])
            return min
    
    if __name__ == "__main__":        
            test = [1, 3, 10, 5, 23, 50]
            print(calc(test))

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

18.

import re
    list1 = input('请输入一组数字：')
    list1 = re.findall(r'\d', list1)
    
    for i in range(len(list1)):
            list1[i] = int(list1[i])
    
    list1.reverse()        
    for each in list1:
            print(each, end = ' ')

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

19.

import os
    while True:
            filename=input('请输入文件名：')
            if os.path.exists(filename):
                    print('此文件已存在！')
                    break
            else:
                    all=[]
                    while True:
                            content=input('请加入内容：')
                            if content=='.':
                                    print('退出')
                                    break
                            else:
                                    all.append(content)
                    fobj=open(filename,'w')
                    str_list=[i+'\n'for i in all]
                    fobj.writelines(str_list)
                    fobj.close()
                    break

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

20.

创建游戏画布：

from tkinter import *
    import random
    import time
    
    tk = Tk()
    tk.title("Game")
    tk.resizable(0,0)
    tk.wm_attributes("-topmost",1)
    canvas = Canvas(tk,width=500,height=400,bd=0,highlightthickness=0)
    canvas.pack()
    tk.update()

创建 ball 类：

class Ball:
        def __init__(self,canvas,color):
            self.canvas = canvas 
            self.id = canvas.create_oval(10,10,25,25,fill=color)
            self.canvas.move(self.id,245,100)
        def draw(self):
            pass

创建主循环：

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

创建实例化对象：

ball = Ball(canvas,'red')

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*（未完待续，持续更新）*