Python 入门编程题（二）答案_for i in range(len(lt)): #遍历你输入类型序列的长度(假设输入stirng

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')

---

（未完待续，持续更新）