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【学习记录】Python编程:从入门到实践 第2章练习题

  • 2026-06-28 22:12:57
【学习记录】Python编程:从入门到实践 第2章练习题
知识点

变量( variable )、值 ( value )字符串(string)整数(integer)、浮点数(float)注释( comment )

练习2.1: 简单消息

练习2.1 简单消息

将⼀条消息赋给变量,并将其打印出来。

21_simple_message.py

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message = "Hello World!"print(message)

练习 2.2 :多条简单消息

练习 2.2 :多条简单消息

将⼀条消息赋给变量,并将其打印出来;再将变量的值修改为⼀条新消息,并将其打印出来。

22_simple_messages.py

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message = "Hello World!"print(message)message = "Hello Python World!"print(message)
Tip

在Python中,变量是存储值的盒子这种描述是不准确的。正确的说法是 变量是可以被赋值的标签 ,变量指向特定的值 。


练习 2.3:个性化消息

练习 2.3:个性化消息

用变量表示一个人的名字,并向其显示一条消息。显示的消息应非常简单,如下所示。Hello Eric, would you like to learn some Python today?

23_personal_message.py

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name="Alice"message = f"Hello {name}, would you like to learn some Python today?"print(message)

练习2.4:调整名字的大小写

练习2.4:调整名字的大小写

用变量表示一个人的名字,再分别以全小写、全大写和首字母大写的方式显示这个人名。

24_name_cases.py

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name="Bob black"print(name.lower())print(name.upper())print(name.title())

练习2.5:名言1

练习2.5:名言1

找到你钦佩的名人说的一句名言,将这个名人的姓名和名言打印出来。输出应类似于下面这样(包括引号)。Albert Einstein once said, "A person who never made a mistake nevertried anything new.

25_famous_quote1.py

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print('Albert Einstein once said, "A person who never made a mistake never tried anything new."')

练习2.6:名言2

练习2.6 名言2

重复练习2.5,但用变量famous_person表示名人的姓名,再创建要显示的消息并将其赋给变量message,然后打印这条消息。

26_famous_quote2.py

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famous_person = "Albert Einstein"message = f'{famous_person} once said, "A person who never made a mistake never tried anything new."'print(message)

练习2.7:删除人名中的空白

练习2.7:删除人名中的空白

用变量表示一个人的名字,并在其开头和末尾都包含一些空白字符。务必至少使用字符组合"\t"和"\n"各一次。打印这个人名,显示其开头和末尾的空白。然后,分别使用函数lstrip()、rstrip()和strip()对人名进行处理,并将结果打印出来.

27_stripping_names.py

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name=" \tAlice \n"print(name)print(name.lstrip())print(name.rstrip())print(name.strip())

练习2.8:文件扩展名

练习2.8:文件扩展名

Python 提供了removesuffix()方法,其工作原理与removeprefix()很像。请将值'python_notes.txt'赋给变量filename,再使用removesuffix()方法来显示不包含扩展名的文件名,就像文件浏览器所做的那样。

28_file_extension.py

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filename = 'python_notes.txt'# 不显示扩展名print(filename.removesuffix('.txt'))

字符串方法总结

方法
功能
参数
title()
每个单词首字母大写
upper()
字母全大写
lower()
字母全小写
rstrip()
删除右侧空白
lstrip()
删除左侧空白
strip()
删除两侧空白
removeprefix(prefix)
去除指定前缀
参数prefix为指定前缀
removesuffix(suffix)
去除指定后缀
参数suffix为指定后缀
Tip
  1. 用户很可能不会提供我们期望的大小写,因此可以在存储时使用lower()将字符串全部转换为小写,在显示时再对其进行合适的处理。
  2. 在处理用户输入时,最好先使用strip()进行处理,然后再进行存储。

练习2.9:数字8

练习2.9:数字8

编写4个表达式,分别使用加法、减法、乘法和除法运算,但结果都是数字8。为了使用函数调用print()来显示结果,务必将这些表达式用括号括起来。也就是说,你应该编写4行类似于这样的代码:print(5+3)输出应为4行,其中每行都只包含数字 8。

29_number_eight.py

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# 结果都为数字8的运算print(4+4)print(88-80)print(2*4)print(40/5)
Tip

任意两个数相除,结果是浮点数

练习2.10:最喜欢的数

练习2.10:最喜欢的数

用一个变量来表示你最喜欢的数,再使用这个变量创建一条消息,指出你最喜欢的数是什么,然后将这条消息打印出来。

210_favorite_number.py

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number = 3.14message = f"我最喜欢的数是{number}"print(message)

练习2.11:添加注释

练习2.11:添加注释

选择你编写的两个程序,在每个程序中至少添加一条注释。如果程序太简单,实在没有什么需要说明的,就在程序文件开头加上你的姓名和当前日期,再用一句话阐述程序的功能。


练习2.12:Python 之禅

练习2.12:Python 之禅

在Python 终端会话中执行命令import this,并粗略地浏览一下其他指导原则。

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  1. CONNECT:[ UseTime:0.000922s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000919s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004561s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.016083s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000971s ]
  6. SELECT * FROM `set` [ RunTime:0.000279s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000697s ]
  8. SELECT * FROM `article` WHERE `id` = 487282 LIMIT 1 [ RunTime:0.001621s ]
  9. UPDATE `article` SET `lasttime` = 1783086150 WHERE `id` = 487282 [ RunTime:0.026668s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000669s ]
  11. SELECT * FROM `article` WHERE `id` < 487282 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002865s ]
  12. SELECT * FROM `article` WHERE `id` > 487282 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.011236s ]
  13. SELECT * FROM `article` WHERE `id` < 487282 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005834s ]
  14. SELECT * FROM `article` WHERE `id` < 487282 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003361s ]
  15. SELECT * FROM `article` WHERE `id` < 487282 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004373s ]
0.322943s