Python教学6
python第6章字典课后习题答案
Solutions - Chapter 66-1: PersonUse a dictionary to store information about a person you know. Store their first name, last name, age, and the city in which they live. You should have keys such as first_name, last_name, age, and city. Print each piece of information stored in your dictionary.Output:6-2: Favorite NumbersUse a dictionary to store people’s favorite numbers. Think of five names, and use them as keys in your dictionary. Think of a favorite number for each person, and store each as a value in your dictionary. Print each person’s name and their favorite number. For even more fun, poll a few friends and get some actual data for your program.Output:6-3: GlossaryA Python dictionary can be used to model an actual dictionary. However, to avoid confusion, let’s call it a glossary.Think of five programming words you’ve learned about in the previous chapters. Use these words as the keys in yourglossary, and store their meanings as values.Print each word and its meaning as neatly formatted output.You might print the word followed by a colon and then itsmeaning, or print the word on one line and then print itsmeaning indented on a second line. Use the newline character ('\n') to insert a blank line between each word-meaning pair in your output.Output:6-4: Glossary 2Now that you know how to loop through a dictionary, clean up the code from Exercise 6-3 (page 102) by replacing your seriesof print statements with a loop that runs through the dictionary’s keysand values. When you’re sure that your loop works, add five more Python terms to your glossary. When you run your program again, these new words and meanings should automatically be included in the output.Output:6-5: RiversMake a dictionary containing three major rivers and the country each river runs through. One key-value pair might be 'nile': 'egypt'.∙Use a loop to print a sentence about each river, such as The Nile runs through Egypt.∙Use a loop to print the name of each river included in the dictionary.∙Use a loop to print the name of each country included in the dictionary.Output*:*Sometimes we like to think of Alaska as our own separate country.6-6: PollingUse the code in favorite_languages.py (page 104).∙Make a list of people who should take the favorite languages poll. Include some names that are already in the dictionary and some that are not.∙Loop through the list of people who should take the poll. If they have already taken the poll, print a message thanking them for responding. If they have not yet taken the poll, print a message inviting them to take the poll.Output:6-7: PeopleStart with the program you wrote for Exercise 6-1 (page 102). Make two new dictionaries representing different people, and store all three dictionaries in a list called people. Loop through your list of people. As you loop through the list, print everything you know about each person.Output:6-8: PetsMake several dictionaries, where the name of each dictionary is the name of a pet. In each dictionary, include the kind of animal and the owner’s name. Store these dictionaries in a list called pets. Next, loop through your list and as you do print everything you know about each pet.Output:6-9: Favorite PlacesMake a dictionary called favorite_places. Think of three names touse as keys in the dictionary, and store one to three favorite places for each person. To make this exericse a bit more interesting, ask somefriends to name a few of their favorite places. Loop through the dictionary, and print each person’s name and their favorite places.Output:6-10: Favorite NumbersModify your program from Exercise 6-2 (page 102) so each person can have more than one favorite number. Then print each person’s name along with their favorite numbers.Output:6-11: CitiesMake a dictionary called cities. Use the names of three cities askeys in your dictionary. Create a dictionary of information about each city and include the country that the city is in, its approximate population, and one fact about that city. The keys for each city’s dictionary should be something like country, population, and fact.Print the name of each city and all of the information you have stored about it.Output:。
【python密码学编程】6.凯撒加密法
【python密码学编程】6.凯撒加密法凯撒加密法的密钥是0~25的整数# _*_ coding:utf-8 _*_#Caeser Ciperimport pyperclipmessgae = 'this is my secret messgae.'key = 13mode = 'encrypt'#模式是加密⽽⾮解密（decrypt）LETTERS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'#常量要⼤写translated = ''messgae = messgae.upper()for symbol in messgae:if symbol in LETTERS:num = LETTERS.find(symbol) #find()返回的是该字符在字符串中的位置if mode == 'encrypt':#判断当前是加密还是解密过程num = num+keyelif mode == 'decrypt':num = num-keyif num > len(LETTERS):#当处理后的数字脱离26个字母的数字范围后的处理num = num - len(LETTERS)elif num < 0:num = num + len(LETTERS)translated = translated + LETTERS[num]#空字符串⼀个个加上翻译后得到的字符else:#如果要翻译的字符不在26个⼤写字母的范围内translated =translated + symbolprint translatedpyperclip.copy(translated)>>>GUVF VF ZL FRPERG ZRFFTNR.[Finished in 0.8s]仅允许⾮商业转载,转载请注明出处。
青少年编程 python 6级
青少年编程 python 6级（原创实用版）目录1.青少年编程的重要性2.Python 编程语言的简介3.Python 6 级的含义和等级体系4.Python 6 级对青少年编程的帮助5.如何学习和提高 Python 编程水平正文随着科技的飞速发展，编程技能已成为当今社会不可或缺的一项技能。
特别是在青少年阶段，学习编程不仅能够锻炼逻辑思维能力，还可以提高解决问题的能力。
因此，越来越多的青少年开始学习编程。
在众多编程语言中，Python 以其简洁明了的语法和强大的功能受到了广泛欢迎。
Python 6 级作为青少年编程的一个等级标准，对于青少年编程学习具有重要的指导意义。
Python 是一种广泛应用于网络编程、数据分析、人工智能等领域的编程语言。
它易于上手，即使是初学者也可以在短时间内掌握基本的编程技巧。
Python 语言的特点是代码结构清晰、语法简单，因此非常适合初学者入门。
在青少年编程教育中，Python 语言成为了许多学生的首选。
Python 6 级是青少年编程等级体系中的一个级别。
这个级别主要针对已经掌握了 Python 编程基本语法和应用的青少年，要求他们能够运用Python 编写较为复杂的程序，解决实际问题。
Python 6 级对于青少年编程学习具有重要的意义，它可以帮助学生更好地了解自己的编程水平，为今后的学习和发展奠定基础。
那么，如何学习和提高 Python 编程水平呢？首先，学生需要掌握Python 的基本语法和常用库，这可以通过阅读相关教材和参加编程课程来实现。
其次，学生应该多加练习，编写实际的程序，不断积累经验。
此外，参加编程比赛和交流活动也是提高编程水平的有效途径。
总之，Python 6 级对于青少年编程学习具有重要的指导意义。
在学习过程中，青少年应该注重基本功的培养，多加练习，不断提高自己的编程水平。
《Python编程案例教程》(高登) 6
任务一
面向对象程序设计（object oriented programming，OOP）是将所有预处理的问题抽象 为对象，并将相应的属性和行为封装起来，以提高软件的重用性、灵活性和扩展性。
现实世界中，对象就是客观存在的某一事物，如一个人、一辆自行车等。而面向对象的编程世 界中，对象具有属性和行为两个特征，每个对象都有各自的属性和行为。而类是对这些具有共同特 征的对象的概括、归纳和抽象表达。例如，将人抽象为“人”类，它具有名字、性别等属性，行走、 吃饭等行为，那么具体的名字为“小明”“小红”的个体就是“人”类的对象，具体关系如图6-1 所示。
项目六 面向对象编程
项目六
项目导读
Python是真正面向对象的高级动态编程语言，它以类和对象作为面向对象编程的基础， 具有封装、继承和多态三大基本特性，能够很好地支持代码复用和设计复用，使得代码具有更 好的可读性和可扩展性。本项目将详细介绍Python中面向对象编程的方法。
项目六
学习目标
✓ 理解面向对象程序设计思想。 ✓ 掌握定义类和创建对象的方法，self参数、构造方法和析构方法的使用
项目六
Content
任务一
开发“动物园里有什么”游戏
任务一
开发“动物园里有什么”游戏
任务描述
“动物园里有什么”游戏想要实现的功能是轮流说出一种动物的种类及叫声，如果该动物在 预先规定的范围中，则输出动物的种类及叫声，否则终止游戏。本任务将带领大家利用类和对 象，开发“动物园里有什么”游戏。
知识链接
person = Person() person.speak() print('我是{}'.format())
#定义Person类 #定义姓名变量 #定义说方法
Python程序设计课件第6章 Python文件与数据库操作
1. write(string)方法
f.write('Our wills unite like a fortress') ➢ write语句不会自动换行，如果需要换行，则要使用换行符'\n' 2.read (size)方法：从指定文件中读取指定数据
文件对象.read([size])
➢ 参数size表示设置的读取数据的字节数，若该参数缺省，则一次读 取指定文件中的所有数据。
➢ 存取是直接的值处理 ➢ 不需要编/解码，不存在
转换时间，但通常无法 直接读懂
目录
• 文件相关的基本概念 • 文件夹与目录操作 • 文件基本的操作 • 处理XML格式文件的数据高阶函数 • JSON格式文件及其操作 这里说明 • Python操作MySQL数据库 图片内容
1 os.path模块
f.seek(2, 0)
4.close()方法：该方法实现关闭文件
3 按行对文件内容读写
文件基本的操作
1.writelines()方法
该方法需要通过制定一个字符串类型的列表，该方法会将列表中的每一
个元素值作为单独的一行写入文件。
【例】利用writelines()方法演示文件写入操作的应用示例。
fo = open(".\\text.txt", "w") print("读写的文件名：", ) seq = ["Hello\n","life is short\n", "I want to learn python\n"] line = fo.writelines(seq) fo.close() 运行结果： 读写的文件名： .\text.txt
Python基础（6）——实现输入任意多个数，并计算其平均值
Python基础（6）——实现输⼊任意多个数，并计算其平均值学习了Python相关数据类型，函数的知识后，利⽤字符串的分割实现了输⼊任意多个数据，并计算其平均值的⼩程序。
思路是接收输⼊的字符串，以空格为分隔符，将分割的数据存⼊列表（lst1）中，将lst1中的数据转存⼊另⼀个空列表（lst）中，转存时将字符串转化为整型，从⽽利⽤函数求出lst中数的和、平均值，是Python基础（5）中结尾程序的升级版。
代码如下：print("-----求平均值，可输⼊任意多个数-------")lst = [] #定义⼀个空列表str = raw_input("请输⼊数值，⽤空格隔开:")lst1 = str.split(" ")#lst1⽤来存储输⼊的字符串，⽤空格分割i = 0while i <= len(lst1)+1:lst.append(int(lst1.pop()))#将lst1的数据转换为整型并赋值给lsti += 1#print(lst)def sum(list):"对列表的数值求和"s = 0for x in list:s += xreturn sdef average(list):"对列表数据求平均值"avg = 0avg = sum(list)/(len(list)*1.0) #调⽤sum函数求和return avgprint("avg = %f"%average(lst))运⾏结果：-----求平均值，可输⼊任意多个数-------请输⼊数值，⽤空格隔开:21 32 45 65avg = 47.333333***Repl Closed***此程序不光可以运算平均值，可以应⽤于⼀切需要多个数据输⼊（在⼀⾏内完成）的程序中，是⼀个⼩模块。
Python入门教程PPT课件：第6章 函数_PPT
局部 变量
1
全局 变量
2
匿名函数（lambda）
函数
[ 概念]
简单理解：函数就是可以完 成某项工作的代码块。
返回值 参数传递 函数的创建和调用
变量的作用域 匿名函数（lambda）
函数的创建和调用
1 创建函数 2 调用函数
不写()
def functionname([parameterlist]): ['''comments'''] [functionbody]
放在所有参数的最后
def functionname(…,[parameter1 = defaultvalue1]): [fuห้องสมุดไป่ตู้ctionbody]
返回值
None
return [value]
变量的作用域
[ 概念]
变量的作用域是指程序代码能够 访问该变量的区域，如果超出该区域， 再访问时就会出现错误。
return
()
functionname([parametersvalue])
参数传递
了解形 式参数 和实际
参数
1
关键 字参
数
3
位置 参数
2
为参数 设置默
认值
4
可变 参数
5
[ 概念]
位置参数是必须按照定义时
的个数和顺序进行参数传递，也
称必备参数。
[ 概念]
关键字参数是指使用形式参 数的名字来确定输入的参数值。
大学Python学习课件第6讲 循环中断语句break-continue
2018/5/8
21
比较break语句和continue语句
请通过以下两个程序了解break语句和
continue语句的区别。
程序代码1：
程序代码2：
程序运行结果：
2018/5/8
程序运行结果：
22
3.3 应用实例
学生成绩统计 【例3-14】输入若干个同学的计算机成绩。
求出这些同学的计算机成绩平均值，最小 值和最大值。
for 变量 in 序列或迭代器: 循环体
2018/5/8
还有值未取吗？ 否 是
循环体
4
for循环 7.1 for语句
for 变量 in 序列或迭代器: 循环体
else: else语句块
还有值未取吗？ 否 是
循环体
Else语句块
2018/5/8
5
循环体后的else语句
循环正常退出后，执行else语句块； 如果是因为执行循环体中的break语句而
程序的一次运行结果：
2018/5/8
23
【例3-14】续
程序代码：
2018/5/8
24
【例3-14】续
思考：
（1）为什么在计算平均成绩时，用的是表达 式sAvg*1.0/sCnt，而不是表达式 sAvg/sCnt。如果使用后面一个表达式，程序 的运行结果将会怎样，请先进行分析，然后实 验观察。
请用for和while两种方法实现。
程序运行结果：
2018/5/8
14
程序代码：Exp_break_for.py和Exp_break_while.py
2018/5/8
15
思考题：还有何种方法不用break也能实现该功能？程序保存为 Exp_no_break.py
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
Assignment 3
Due by Thursday, 19th 2015, midnight
Instructions
The assignment will be graded out of 100 points. Create a text document for your answers. Please use Python 3 (3.4 is the current version)
Once you type your answers using your preferred word processor, generate a TEXT (.txt) file which has to have the named as name [yourname]_assignment3.
The .txt has to include the following information on the first page: your first and last name and your UTA ID.
The code submitted in the questions that require code to be written, should be exactly the same with the code you wrote in your python environment (i.e. IDLE). We will be copying-pasting your code from the text document to our python installation.
Upload your file via the Blackboard.
Task 1 (20 pts.)
Write a program that asks the user to specify an integer from 1 to 10. If the integer is equal or lower than 5, the program should add all the numbers (starting from 1) up to the user input and print the result. If the number is between 6 and 10 (including 6), the program should multiply all the numbers up to the user input (or in other words the program should calculate the factorial of the user input) and print the result. Below are some examples of how the program should function.
Please provide an integer between 1 and 10.
6
The factorial of 6 is 720.
---------------------
Please provide an integer between 1 and 10.
4
The sum of the numbers from 1 to 4 is 10.
---------------------
Please provide an integer between 1 and 10.
11
The number you provided is not between 1 and 10.
Task 2 (10 pts.)
Write a program without using loops that asks the user to enter a number, and:∙If the number is less than zero, the program prints a message that the number is negative.
∙If the number is greater than or equal to 0 and less than 1 million, the program prints a message which tells how many digits the number has.
∙If the number is greater than or equal to 1 million, the program prints a message which tells that the number has more than six digits.
Task 3 (20 pts.)
Write a program using loops that asks the user to enter a number, and:
∙If the number is less than zero, the program prints a message that the number is negative.
∙If the number is greater than or equal to 0 and less than 1 million, the program prints a message which tells how many digits the number has.
∙If the number is greater than or equal to 1 million, the program prints a message which tells that the number has more than six digits.
Task 4 (10 pts.)
Write a program which asks the user to give a sentence and returns the number of words the sentence includes. When we write a sentence, you know that we separate words using a space.
Task 5 (25 pts.)
The table below shows the questions that have to be used in a computer assessment for students of the first three grades (1st, 2nd or 3rd) in the elementary school. Each question has a base of 2 points but has a different weight as you can see in the table below. Write a program that asks the user to provide his grade of the elementary school and based on the user input, the appropriate questions appear one by one. The user provides his/her answer to each question and in the end the program calculates the final score (maximum score is 10) and prints it to the user. If the score is higher than 8, the program also prints a message ‘Congratulations!’. Once the test finishes, the student is asked if he/she wants to take the test again. The user
eith er types in ‘yes’ and the questions start over again, or ‘no’ and the program finishes with a message ‘Have a nice day’.
Task 6 (15 pts.)
Write a program that takes two integers a and b. Your program will need to compute a/b and b/a (in this order). However as we know, you cannot divide by zero. Your program will have to check for that before performing the division. If the denominator is zero, print the text ‘Undefined', otherwise, print the result of the division. Finally once the result appears, ask the user whether he/she wants to try again with new a, b integer numbers.。