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Python入门教程|速览Python语法

  • 2026-01-17 11:58:39
Python入门教程|速览Python语法

如果你刚接触编程,或者正在寻找一门上手快、应用广的语言,那么 Python大概率是你绕不开的选择。Python 语法简洁、可读性强,被广泛应用于Web开发、自动化运维、数据分析、人工智能等领域,也是很多高校和企业的入门首选语言。

本文将从最基础的语法讲起,带你快速认识Python的核心概念,为后续学习打好基础。

一、为什么推荐 Python?

相比其他编程语言,Python 有几个非常明显的优势:
  • 语法接近自然语言,新手友好
  • 学习成本低,开发效率高
  • 生态成熟,第三方库丰富
  • 应用场景广,职业发展空间大
可以说,Python 是最适合入门编程的语言之一

二、Python 的第一个程序

安装好 Python 后,打开终端或命令行,输入:
print("Hello, Python")
运行后看到输出,说明你的第一个 Python 程序已经成功运行。
Python 使用缩进来表示代码块,这是它最重要的语法特征之一。

三、变量与数据类型

1️⃣ 变量的定义

Python 中不需要声明变量类型,直接赋值即可:
name = "Alice"age = 18
变量名建议使用有意义的英文单词,增强可读性。

2️⃣ 常见数据类型

整型(int):10
浮点型(float):3.14
字符串(str):"hello"
布尔型(bool):True / False
查看变量类型:
type(变量名)

四、常用运算符

1️⃣ 算术运算

a = 10 # 变量声明b = 3print(a + b) # 加法运算print(a / b) # 除法运算print(a % b) # 取余运算

2️⃣ 比较与逻辑运算

# 比较运算a > b a == ba != b # 逻辑运算 a > 5 and b < 10

五、条件判断(if 语句)

Python 使用 if 判断条件,结构清晰:
# 下面的展示的【.】代表一个空格,而不是程序中加入对应的.score = 85if score >= 90:....print("优秀")elif score >= 60:....print("及格")else:....print("不及格"
注意:缩进必须统一,否则程序会报错。

六、循环语句(for / while)

1️⃣ for 循环

for i inrange(5):    print(i)
常用于遍历列表、字符串等。

2️⃣ while 循环

count = 0while count < 3:    print(count)    count += 1
使用时要注意避免死循环。最后的count += 1 是避免死循环的关键

七、函数的基本使用

函数用于封装重复逻辑:
def add(a, b):    return a + bresult = add(23)print(result)
函数让代码更清晰,也更容易维护。

八、列表与字典

1️⃣ 列表(list)

names = ["Tom""Jack""Lucy"]print(names[0])

2️⃣ 字典(dict)

user = {"name""Tom""age"18}print(user["name"])
列表和字典是 Python 中最常用的数据结构。

九、写在最后

Python语法并不复杂,甚至可以说是相当简单,但打好基础仍然非常重要。建议你多动手练习,从简单脚本开始,把学到的语法用到真实场景中。当你能用 Python 自动完成一些重复工作时,就会真正体会到编程的价值。
如果你希望继续学习 Python 的实战应用,比如自动化、爬虫或数据分析,欢迎持续关注后续内容。
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  1. CONNECT:[ UseTime:0.000537s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000820s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000309s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000279s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000506s ]
  6. SELECT * FROM `set` [ RunTime:0.000199s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000564s ]
  8. SELECT * FROM `article` WHERE `id` = 460257 LIMIT 1 [ RunTime:0.000391s ]
  9. UPDATE `article` SET `lasttime` = 1770592709 WHERE `id` = 460257 [ RunTime:0.010323s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.006001s ]
  11. SELECT * FROM `article` WHERE `id` < 460257 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000511s ]
  12. SELECT * FROM `article` WHERE `id` > 460257 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000349s ]
  13. SELECT * FROM `article` WHERE `id` < 460257 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010252s ]
  14. SELECT * FROM `article` WHERE `id` < 460257 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000853s ]
  15. SELECT * FROM `article` WHERE `id` < 460257 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002819s ]
0.101411s