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从零开始学python-变量

  • 2026-02-03 04:16:25
从零开始学python-变量

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前言:

   主要分享的是Python版本为Python3的内容。

一、什么是变量

     在Python中,变量是用于存储数据的容器。你可以将变量理解为一个带标签的盒子,标签就是变量名,盒子里装的就是数据。

     从技术角度讲,变量是内存位置的引用。当你创建一个变量时,Python会在内存中分配一块空间来存储数据,而变量名则指向这个内存位置。

# 创建变量name = "张三"age = 25print(name)      # 输出: 张三print(age)       # 输出: 25

     Python变量有一个重要特点:变量本身没有类型,类型属于值(对象)。这意味着同一个变量可以存储不同类型的数据,可以使用type()来查看变量被赋值以后的类型。

x = 10          # x现在指向一个整数print(type(x))  # 输出: <class 'int'>x = "hello"     # x现在指向一个字符串print(type(x))  # 输出: <class 'str'>

二、变量的作用

变量在编程中扮演着至关重要的角色:

1. 数据存储与重用

# 计算圆的面积radius = 5pi = 3.14159area = pi * radius * radiusprint(f"半径为{radius}的圆面积是: {area}")# 输出: 半径为5的圆面积是: 78.53975# 修改半径值,无需重写整个公式radius = 8area = pi * radius * radiusprint(f"半径为{radius}的圆面积是: {area}")# 输出: 半径为8的圆面积是: 201.06176

2. 提高代码可读性

# 没有变量的代码(难以理解)print((60 * 60 * 24) * 7)# 使用变量的代码(清晰明了)seconds_per_minute = 60minutes_per_hour = 60hours_per_day = 24days_per_week = 7seconds_per_week = seconds_per_minute * minutes_per_hour * hours_per_day * days_per_weekprint(f"一周有{seconds_per_week}秒")

3. 数据传递与操作

# 用户输入处理user_name = input("请输入您的姓名: ")user_age = int(input("请输入您的年龄: "))# 数据处理birth_year = 2024 - user_agegreeting = f"您好,{user_name}!您出生于{birth_year}年。"print(greeting)

三、变量命名规则与规范

命名规则(必须遵守)

  1. 只能包含:字母(a-z, A-Z)、数字(0-9)和下划线(_)

  2. 不能以数字开头

3. 区分大小写

4. 关键字不能用作变量名

# 合法的变量名my_var = 1var2 = 2_private = 3VAR_NAME = 4varName = 5# 不合法的变量名# 2var = 1    # 错误:以数字开头# my-var = 2  # 错误:包含连字符# class = 3   # 错误:使用关键字

命名规范(约定俗成)

  1. 小写蛇形命名法:用于普通变量和函数名

user_name = "张三"total_count = 100

2. 大写蛇形命名法:用于常量

MAX_SIZE = 1024PI = 3.14159

3. 驼峰命名法:用于类名

class UserProfile:  # 类使用驼峰命名    def __init__(self):        self.user_name = ""  # 实例变量使用小写蛇形

4. 单下划线开头:表示"内部使用"的变量

_internal_var = "仅供内部使用"

5. 双下划线开头:表示名称修饰(Name Mangling)

__private_var = "私有变量"

6. 避免使用的情况:

  •   单个字符(除了计数器i, j, k或坐标x, y, z)

  •   含义模糊的缩写

  •   拼音或中英混合

  •   慎用小写字母1和大写字母o,因为它们可能被人错看成数字1和0。

四、变量的语法与使用

1. 基本赋值

# 单个赋值x = 10name = "Alice"# 多个变量赋同一个值a = b = c = 0print(a, b, c)  # 输出: 0 0 0# 多个变量赋不同的值(元组解包)x, y, z = 102030print(x, y, z)  # 输出: 10 20 30# 交换两个变量的值(无需临时变量)a, b = 1020print(f"交换前: a={a}, b={b}")  # 输出: 交换前: a=10, b=20a, b = b, aprint(f"交换后: a={a}, b={b}")  # 输出: 交换后: a=20, b=10

2. 复合赋值运算符

# 加法赋值count = 5count += 3  # 相当于 count = count + 3print(count)  # 输出: 8# 减法赋值count -= 2  # 相当于 count = count - 2print(count)  # 输出: 6# 乘法赋值count *= 2  # 相当于 count = count * 2print(count)  # 输出: 12# 除法赋值count /= 3  # 相当于 count = count / 3print(count)  # 输出: 4.0# 其他复合运算符count **= 2  # 幂运算赋值: count = count ** 2count //= 3  # 整除赋值: count = count // 3count %= 2   # 取模赋值: count = count % 2

3. 变量与数据类型

# 整数age = 25temperature = -10large_number = 1_000_000  # Python3.6+支持使用下划线提高可读性# 浮点数price = 19.99pi = 3.1415926535scientific = 1.23e-4  # 科学计数法: 0.000123# 字符串name = "张三"message = 'Hello, World!'multiline = """这是一个               多行字符串"""# 布尔值is_active = Truehas_permission = False# 列表(可变序列)fruits = ["苹果""香蕉""橙子"]fruits.append("葡萄")# 元组(不可变序列)coordinates = (10.5, 20.3)# 字典(键值对)person = {"name""张三""age": 25, "city""北京"}# 集合(无序不重复)unique_numbers = {1, 2, 3, 4, 5}

4. 动态类型与类型检查

# 动态类型 - 同一个变量可以存储不同类型的数据value = 100print(type(value))  # 输出: <class 'int'>print(value)        # 输出: 100value = "一百"print(type(value))  # 输出: <class 'str'>print(value)        # 输出: 一百value = [123]print(type(value))  # 输出: <class 'list'>print(value)        # 输出: [1, 2, 3]# 类型检查与转换x = "123"print(type(x))      # 输出: <class 'str'># 字符串转整数x_int = int(x)print(type(x_int))  # 输出: <class 'int'>print(x_int + 10)   # 输出: 133# 整数转字符串y = 456y_str = str(y)print(type(y_str))  # 输出: <class 'str'>print("数字是: " + y_str)  # 输出: 数字是: 456

5. 变量的作用域(后面会分享什么是作用域)

# 全局变量global_var = "我是全局变量"def my_function():    # 局部变量    local_var = "我是局部变量"    print(local_var)  # 可以访问局部变量    print(global_var)  # 可以访问全局变量my_function()# print(local_var)  # 错误:在函数外部无法访问局部变量# 修改全局变量counter = 0def increment():    global counter  # 声明使用全局变量    counter += 1increment()print(counter)  # 输出: 1

6. 删除变量

# 创建变量temp_data = "临时数据"print(temp_data)  # 输出: 临时数据# 删除变量del temp_data# print(temp_data)  # 错误:变量已被删除,NameError: name 'temp_data' is not defined

五、总结

Python变量是编程的基础,理解变量的本质、作用、命名规则和使用方法是掌握Python的关键。记住:

  • 变量是数据的引用,而不是数据本身

  • 命名要清晰明确,遵循命名规范

  • Python是动态类型语言,变量类型可以改变

  • 合理使用变量可以提高代码的可读性和可维护性

【微语】人生的层次:生存,苟活,小成,大成,开心,从容,忘我,无我。

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  1. CONNECT:[ UseTime:0.000938s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001577s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002461s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000678s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001422s ]
  6. SELECT * FROM `set` [ RunTime:0.000772s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001497s ]
  8. SELECT * FROM `article` WHERE `id` = 465745 LIMIT 1 [ RunTime:0.008978s ]
  9. UPDATE `article` SET `lasttime` = 1770497029 WHERE `id` = 465745 [ RunTime:0.018159s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000690s ]
  11. SELECT * FROM `article` WHERE `id` < 465745 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001041s ]
  12. SELECT * FROM `article` WHERE `id` > 465745 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001406s ]
  13. SELECT * FROM `article` WHERE `id` < 465745 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002041s ]
  14. SELECT * FROM `article` WHERE `id` < 465745 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008835s ]
  15. SELECT * FROM `article` WHERE `id` < 465745 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005629s ]
0.145157s