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课程一:Python 编程入门基础

  • 2026-06-29 02:42:37
课程一:Python 编程入门基础

适合对象:零编程基础的大一新生  课程目标:适合零编程基础的大一新生学习Python基础知识。每个部分都包含了关键概念、示例代码以及进一步学习的链接,帮助学习者逐步掌握Python编程。


1. Python简介

  • Python是什么
  • 一种高级编程语言,强调代码的可读性和简洁性。
  • 广泛应用于Web开发、数据分析、人工智能等领域。
  • Python的特点
  • 语法简单,易于学习。
  • 丰富的库和框架支持。
  • 学习资源
  • 官方文档、在线教程、社区论坛等。

2. Python基础数据类型与变量

  • 数据类型

  • 整数(int)、浮点数(float)、布尔值(bool)、字符串(str)等。

  • 变量

  • 变量是存储数据的容器。

  • 变量名规则:以字母或下划线开头,后跟字母、数字或下划线。

  • 示例

    name = "Alice"# 字符串age = 20# 整数is_student = True# 布尔值

3. 字符串与编码

字符串回顾

  • 字符串
  • 由一系列字符组成,可以用单引号(')或双引号(")表示。
  • 字符串是不可变的,一旦创建就不能修改。

字符串编码

  • 编码
  • UTF-8是常用的字符编码方式,支持多语言字符。
  • Python 3默认使用UTF-8编码处理字符串。

f-string(格式化字符串字面值)

  • 什么是f-string

  • f-string是Python 3.6引入的一种字符串格式化方法。

  • 使用前缀fF,在字符串中嵌入表达式,用大括号{}括起来。

  • f-string的优势

  • 代码简洁,易读性强。

  • 性能优于传统的%格式化和str.format()方法。

  • 基本用法

    name = "Alice"age = 20# 使用f-string格式化字符串message = f"My name is {name}, and I'm {age} years old."print(message)  # 输出:My name is Alice, and I'm 20 years old.
  • 表达式求值

  • 大括号{}内可以是任何有效的Python表达式。

    a = 5b = 10print(f"The sum of {a} and {b} is {a + b}.")  # 输出:The sum of 5 and 10 is 15.
  • 多行f-string

  • 使用三引号('''""")可以创建多行f-string。

    name = "Bob"scores = {"math"90"english"85}report = f"""Student Name: {name}Math Score: {scores['math']}English Score: {scores['english']}"""print(report)
  • 格式化数字

  • 可以在大括号内使用格式说明符来控制数字的显示方式。

    pi = 3.1415926print(f"Pi is approximately {pi:.2f}.")  # 输出:Pi is approximately 3.14.

示例总结

  • 简单示例

    product = "Apple"price = 1.99quantity = 5total = price * quantityprint(f"I bought {quantity}{product}s for ¥{total:.2f}.")# 输出:I bought 5 Apples for ¥9.95.

4. 使用list和tuple

  • list(列表)

  • 有序集合,可以随时添加和删除其中的元素。

  • tuple(元组)

  • 有序集合,但一旦创建就不能修改。

  • 示例

    my_list = [123]my_tuple = (123)

5. 循环结构

  • for循环

  • 遍历序列(如list、tuple、字符串等)中的每个元素。

  • while循环

  • 当条件为真时,重复执行代码块。

  • 示例

    for i in range(5):  # 输出0到4  print(i)count = 0while count < 5:  print(count)  count += 1

6. 使用dict和set

  • dict(字典)

  • 键值对的集合,用于快速查找。

  • set(集合)

  • 无序且不重复的元素集。

  • 示例

    my_dict = {"name""Alice""age"20}my_set = {1232}  # 实际存储为{1, 2, 3}

7. 函数与参数

  • 函数定义

  • 使用def关键字定义函数。

  • 参数传递

  • 位置参数、默认参数、可变参数等。

  • 示例

    defgreet(name, message="Hello"):  print(f"{message}{name}!")greet("Alice")  # 输出:Hello, Alice!

8. 总结与练习

  • 总结

  • 回顾本节课学习的Python基础知识。

  • 练习

  • 编写一个程序,接收用户输入的名字和年龄,并打印出欢迎信息。

  • 编写一个函数,计算两个数的和并返回结果。

  • 参考资料

  • Python官方入门教程:https://docs.python.org/3/tutorial/index.html

  • Python官网标准库:https://docs.python.org/3/library/index.html

  • 廖雪峰教程Python教程:

    • 数据类型和变量:https://liaoxuefeng.com/books/python/basic/data-types/index.html
    • 字符串和编码(包含字符串基础及进阶用法,f-string作为现代字符串格式化方法值得深入探索):https://liaoxuefeng.com/books/python/basic/string-encoding/index.html
    • 使用list和tuple:https://liaoxuefeng.com/books/python/basic/list-tuple/index.html
    • 循环:https://liaoxuefeng.com/books/python/basic/loop/index.html
    • 使用dict和set:https://liaoxuefeng.com/books/python/basic/dict-set/index.html
    • 函数的参数:https://liaoxuefeng.com/books/python/function/parameter/index.html
  • 扩展学习

  • 探索Python的高级特性,如切片、迭代、列表生成式等。

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  1. CONNECT:[ UseTime:0.000611s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000907s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000343s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001330s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000648s ]
  6. SELECT * FROM `set` [ RunTime:0.000238s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000583s ]
  8. SELECT * FROM `article` WHERE `id` = 487971 LIMIT 1 [ RunTime:0.014018s ]
  9. UPDATE `article` SET `lasttime` = 1783139346 WHERE `id` = 487971 [ RunTime:0.007046s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.003033s ]
  11. SELECT * FROM `article` WHERE `id` < 487971 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.012543s ]
  12. SELECT * FROM `article` WHERE `id` > 487971 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000579s ]
  13. SELECT * FROM `article` WHERE `id` < 487971 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002329s ]
  14. SELECT * FROM `article` WHERE `id` < 487971 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.031257s ]
  15. SELECT * FROM `article` WHERE `id` < 487971 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002549s ]
0.157167s