python习题及答案

                                    作业四
按要求编写程序（任选三题）
1、 编写一个从 1 加到 end 的当型循环。变量 end 的值由键盘输入。假如输入 end
的值为 6，则代码输出的结果应该是 21，也就是 1+2+3+4+5+6 的结果（不要用
sum 作为变量，因为它是内置函数）。

a = input() b=int(a) total = 0 for i in range(b+1): total = i+total print(total)

2、从键盘输入一个整数，判断该数字能否被 2 和 3 同时整除，能否被 2 整除，能否被 3 整除，不能被 2 和 3 整除。输出相应信息。

a = input() b=int(a) if b%2==0 and b%3==0: print('该数字能被 2 和 3 同时整除') elif b%2==0: print('该数字能被 2 整除') elif b%3==0: print('该数字能被 3 整除') else : print('该数字不能被 2 和 3 整除')

for i in range(1001): if i==0: continue s = 0 for j in range(i): if j==0: continue if i%j==0: s=s+j if s==i: print(‘{} its factors are ‘.format(i),end=”) for j in range(i): if j == 0: continue if i % j == 0: print(j,end=’ ‘) print(‘\n’)

4、打印出所有的“水仙花数”，所谓“水仙花数”是指一个 3 位数，其各位数字立方和等于该数本身。例如， 153 是一个水仙花数，因为 153=13+53+33。

for i in range(1000): if i<100: continue s = 0 a = int(i//100) b = int(i//10%10) c = int(i%10) s = a3+b3+c3 if s == i: print("{} 是水仙花数".format(i)) 

j=0 for i in range(101): #循环 if i>0 and i % 7 == 0: #如果能整除7，则再执行循环 continue elif i>0: #如果大于0并且不能被7整除，输出； print("{:3d}".format(i), end=' ') j += 1 #j用来控制每行输出是否是10个 if j % 10 == 0: print('\n') j = 0 else:          continue;

作业八

一、 创建文本文件FarewellCambridge.txt。内容为：

Very quietly I take my leave

As quietly as I came here;

Quietly I wave good-bye

To the rosy clouds in the western sky.

The golden willows by the riverside

Are young brides in the setting sun;

Their reflections on the shimmering waves

Always linger in the depth of my heart.

The floating heart growing in the sludge

Sways leisurely under the water;

In the gentle waves of Cambridge

I would be a water plant!

That pool under the shade of elm trees

Holds not water but the rainbow from the sky;

Shattered to pieces among the duckweeds

Is the sediment of a rainbow-like dream?

To seek a dream? Just to pole a boat upstream

To where the green grass is more verdant;

Or to have the boat fully loaded with starlight

And sing aloud in the splendor of starlight.

But I cannot sing aloud

Quietness is my farewell music;

Even summer insects heap silence for me

Silent is Cambridge tonight!

并用写字板查看（注意：直接将上述诗句拷贝到程序中，不需要自己再次录入）。

file = open('C:/Users/uestc2020/Desktop/hanzhengqiang.txt','w') #在桌面新建一个韩正强.txt文本文档，并且是写的模式 #在文本中写入文字： file.write('''Very quietly I take my leave As quietly as I came here; Quietly I wave good-bye To the rosy clouds in the western sky. The golden willows by the riverside Are young brides in the setting sun; Their reflections on the shimmering waves Always linger in the depth of my heart. The floating heart growing in the sludge Sways leisurely under the water; In the gentle waves of Cambridge I would be a water plant! That pool under the shade of elm trees Holds not water but the rainbow from the sky; Shattered to pieces among the duckweeds Is the sediment of a rainbow-like dream? To seek a dream? Just to pole a boat upstream To where the green grass is more verdant; Or to have the boat fully loaded with starlight And sing aloud in the splendor of starlight. But I cannot sing aloud Quietness is my farewell music; Even summer insects heap silence for me Silent is Cambridge tonight!''') 

二、 对于上一题建立的文本文件，使用read()读文件，并在屏幕上显示。

file = open('C:/Users/uestc2020/Desktop/hanzhengqiang.txt','r') #在桌面打开一个韩正强.txt文本文档，并且是读的模式 #读取文件，并且输出： s=file.read() print(s)

三、 根据给定的文本文件words.txt（可将该文件存放在任意目录，注意打开文件时要加入正确的路径）编写函数loadWords()，words.txt包含若干小写英文单词。要求：

1） 读入该文件，统计并输出单词的个数

2） 返回单词列表（注意：指返回单词列表即可，不要在屏幕上显示）

import re #统计单词个数： def count_words(file_path): with open(file_path) as file: text = file.read() words = re.findall(r'[a-zA-Z]+', text) count = len(words) return count print(count_words('C:/Users/uestc2020/Desktop/words.txt')) 

习题十

一、 编写函数devide(x, y)，x为被除数，y为除数。要求考虑异常情况的处理。

1、 被零除时，输出"division by zero! "；

2、 类型不一致时，强制转换为整数再调用本函数；

3、 若没有上述异常则输出计算结果。

def test(password, earning, age): #assert 1<0 assert password[0] not in ['0','1','2','3','4','5','6','7','8','9'] assert int(earning)>=0 and int(earning)<=20000 assert int(age)>=18 and int(age)<=70 return True print(test('as','11','30'))

二、 编写函数test(password, earning, age)用于检测输入错误。要求输入密码password第一个符号不能是数字，工资earnings的范围是0—20000，工作年龄的范围是18—70。使用断言来实现检查，若三项检查都通过则返回True。

def test(password, earning, age): #assert 1<0 assert password[0] not in ['0','1','2','3','4','5','6','7','8','9'] assert int(earning)>=0 and int(earning)<=20000 assert int(age)>=18 and int(age)<=70 return True 

习题十一

一、 使用tkinter库完成下列程序

1、编程实现如下GUI（只显示，没有回调函数）

import tkinter root = tkinter.Tk() root.title('tk') theLabel=tkinter.Label(root,text='Welcome to Python Tkinter') theLabel.pack() root.geometry('500x300+300+300') button = tkinter.Button(root,text='Click Me') button.pack() root.mainloop() 

2、 编程响应用户事件。“OK”按钮前景为红色，按下“OK”按钮显示"OK button is clicked"，”Cancel“按钮背景为黄色，按下”Cancel“按钮显示"Cancel button is clicked"。

import tkinter def ok_on_click(): print('OK button is clicked') def cancel_on_click(): print('Cancel button is clicked') root = tkinter.Tk() root.title('zy') label = tkinter.Label(root) buttonok = tkinter.Button(root,text='OK',fg='red') buttonok['command']=ok_on_click label.pack() buttonok.pack() root.geometry('500x300+300+300') buttoncancel = tkinter.Button(root,text='Cancel',bg='yellow') buttoncancel['command']=cancel_on_click label.pack() buttoncancel.pack() root.mainloop() 

二、 使用Turtle库完成下列程序

1、绘制一个红色的五角星图形，如图所示。

import turtle as tk tk.fillcolor("red") tk.begin_fill() while True: tk.forward(200) tk.right(144) if abs(tk.pos()) < 1: break tk.end_fill() input() 

2、螺旋线绘制（每一圈是四个线段组成，一共绘制100个线段）。绘制一个螺旋线的图形，如图所示。

import turtle import time turtle.pensize(1) for x in range(100): turtle.forward(x) turtle.left(90) time.sleep(100)