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Python赋值运算符详解

  • 2026-03-24 01:33:32
Python赋值运算符详解
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📚 前言

赋值运算符是编程中最基础也是最重要的概念之一。它们用于给变量赋值,是编写任何程序的基础。本文将详细介绍Python中的各种赋值运算符,并通过丰富的实例帮助你深入理解。


🔤 什么是赋值运算符?

赋值运算符用于将右侧的值赋给左侧的变量。Python提供了多种赋值运算符,从简单的基本赋值到复杂的复合赋值,让代码更加简洁高效。


1️⃣ 基本赋值运算符 (=)

功能:将右侧的值赋给左侧的变量

语法变量 = 值

示例

# 基本赋值
name="Python"
age=25
height=1.75
is_student=True

print(f"姓名: {name}")
print(f"年龄: {age}")
print(f"身高: {height}米")
print(f"是否为学生: {is_student}")

输出

姓名: Python
年龄: 25
身高: 1.75米
是否为学生: True

2️⃣ 加法赋值运算符 (+=)

功能:将右侧的值加到左侧变量上,相当于 变量 = 变量 + 值

语法变量 += 值

示例

# 数值加法赋值
score=100
score+=20# 等同于 score = score + 20
print(f"分数增加后: {score}")  # 输出: 120

# 字符串拼接赋值
greeting="Hello"
greeting+=" World"# 等同于 greeting = greeting + " World"
print(f"拼接后: {greeting}")  # 输出: Hello World

# 列表追加赋值
numbers= [123]
numbers+= [45]  # 等同于 numbers = numbers + [4, 5]
print(f"列表追加后: {numbers}")  # 输出: [1, 2, 3, 4, 5]

3️⃣ 减法赋值运算符 (-=)

功能:从左侧变量中减去右侧的值,相当于 变量 = 变量 - 值

语法变量 -= 值

示例

# 数值减法赋值
temperature=30
temperature-=5# 等同于 temperature = temperature - 5
print(f"温度降低后: {temperature}°C")  # 输出: 25°C

# 集合差集赋值
set1= {12345}
set1-= {34}  # 等同于 set1 = set1 - {3, 4}
print(f"集合差集后: {set1}")  # 输出: {1, 2, 5}

4️⃣ 乘法赋值运算符 (*=)

功能:将左侧变量乘以右侧的值,相当于 变量 = 变量 * 值

语法变量 *= 值

示例

# 数值乘法赋值
price=50
quantity=3
price*=quantity# 等同于 price = price * quantity
print(f"总价: ¥{price}")  # 输出: 总价: ¥150

# 字符串重复赋值
line="-"
line*=20# 等同于 line = line * 20
print(f"分隔线: {line}")  # 输出: --------------------

# 列表重复赋值
pattern= [12]
pattern*=3# 等同于 pattern = pattern * 3
print(f"重复模式: {pattern}")  # 输出: [1, 2, 1, 2, 1, 2]

5️⃣ 除法赋值运算符 (/=)

功能:将左侧变量除以右侧的值,相当于 变量 = 变量 / 值

语法变量 /= 值

示例

# 数值除法赋值
total=100
people=4
per_person=total
per_person/=people# 等同于 per_person = per_person / people
print(f"每人分到: {per_person}")  # 输出: 每人分到: 25.0

# 注意:除法总是返回浮点数
number=10
number/=3
print(f"10 ÷ 3 = {number}")  # 输出: 10 ÷ 3 = 3.3333333333333335

6️⃣ 整除赋值运算符 (//=)

功能:将左侧变量整除右侧的值,相当于 变量 = 变量 // 值

语法变量 //= 值

示例

# 数值整除赋值
total_items=17
boxes=5
items_per_box=total_items
items_per_box//=boxes# 等同于 items_per_box = items_per_box // boxes
print(f"每盒装: {items_per_box}个")  # 输出: 每盒装: 3个

remaining=total_items%boxes
print(f"剩余: {remaining}个")  # 输出: 剩余: 2个

7️⃣ 取模赋值运算符 (%=)

功能:将左侧变量对右侧的值取模,相当于 变量 = 变量 % 值

语法变量 %= 值

示例

# 判断奇偶数
number=27
number%=2# 等同于 number = number % 2
print(f"27 ÷ 2 的余数: {number}")  # 输出: 1(奇数)

# 循环计数器
counter=0
foriinrange(111):
counter+=1
ifcounter%3==0:
print(f"第{i}个数是3的倍数")

# 时间计算(小时制)
hours=25
hours%=24# 24小时制转换
print(f"25小时在24小时制中是: {hours}点")  # 输出: 1点

8️⃣ 幂赋值运算符 (**=)

功能:将左侧变量的幂次方,相当于 变量 = 变量 ** 值

语法变量 **= 值

示例

# 计算平方
side=5
area=side
area**=2# 等同于 area = area ** 2
print(f"边长为{side}的正方形面积: {area}")  # 输出: 25

# 复利计算
principal=10000# 本金
rate=1.05# 年利率5%
years=3
amount=principal
amount**=years# 这里应该是 (1+rate)的years次方
# 正确写法:
amount=principal* (rate**years)
print(f"{years}年后金额: ¥{amount:.2f}")  # 输出: 15762.50

🎯 综合实例:购物车计算

# 购物车系统演示
print("=== 购物车系统 ===")

# 商品列表
items= [
    {"name""苹果""price"5.5"quantity"3},
    {"name""香蕉""price"3.8"quantity"2},
    {"name""橙子""price"6.2"quantity"4}
]

# 初始化变量
total=0# 总价
item_count=0# 商品种类数
total_quantity=0# 总数量

# 计算总价
foriteminitems:
subtotal=item["price"*item["quantity"]
total+=subtotal# 累加总价
item_count+=1# 商品种类+1
total_quantity+=item["quantity"]  # 总数量+1
print(f"{item['name']}: ¥{item['price']} × {item['quantity']} = ¥{subtotal:.2f}")

print(f"\n商品种类: {item_count}种")
print(f"总数量: {total_quantity}个")
print(f"总计: ¥{total:.2f}")

# 应用折扣
discount_rate=0.9# 9折优惠
final_price=total
final_price*=discount_rate# final_price = final_price * discount_rate
print(f"折扣后: ¥{final_price:.2f}")

# 计算节省金额
saved=total
saved-=final_price# saved = saved - final_price
print(f"节省: ¥{saved:.2f}")

📊 赋值运算符对比表

运算符名称等价表达式示例结果
=赋值x = 5x = 10x = 10
+=加法赋值x = x + 3x = 10; x += 3x = 13
-=减法赋值x = x - 3x = 10; x -= 3x = 7
*=乘法赋值x = x * 3x = 10; x *= 3x = 30
/=除法赋值x = x / 3x = 10; x /= 3x = 3.33
//=整除赋值x = x // 3x = 10; x //= 3x = 3
%=取模赋值x = x % 3x = 10; x %= 3x = 1
**=幂赋值x = x ** 3x = 10; x **= 3x = 1000

💡 使用技巧

1. 性能优化

复合赋值运算符通常比分开的运算更快:

# 推荐:更高效
count+=1

# 不推荐:相对较慢
count=count+1

2. 代码可读性

选择更直观的表达方式:

# 清晰易懂
total+=price

# 过于复杂,可读性差
total=total+price* (1+tax_rate/discount

3. 类型一致性

注意运算后的类型变化:

# 整数运算
x=5
x+=3# x 仍然是整数

# 但除法会变成浮点数
x=5
x/=2# x 变成浮点数 2.5

🎓 总结

赋值运算符是Python编程的基础,掌握它们可以:

  • ✅ 让代码更简洁高效

  • ✅ 提高程序性能

  • ✅ 增强代码可读性

  • ✅ 实现复杂的计算逻辑

记住:选择合适的赋值运算符,让你的Python代码更加优雅!


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想了解更多Python编程技巧?欢迎关注我们的微信公众号,获取更多编程干货!


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  1. CONNECT:[ UseTime:0.000639s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000771s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000261s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000300s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000477s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000511s ]
  8. SELECT * FROM `article` WHERE `id` = 480930 LIMIT 1 [ RunTime:0.003017s ]
  9. UPDATE `article` SET `lasttime` = 1774576225 WHERE `id` = 480930 [ RunTime:0.003470s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000264s ]
  11. SELECT * FROM `article` WHERE `id` < 480930 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000386s ]
  12. SELECT * FROM `article` WHERE `id` > 480930 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000667s ]
  13. SELECT * FROM `article` WHERE `id` < 480930 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005041s ]
  14. SELECT * FROM `article` WHERE `id` < 480930 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003460s ]
  15. SELECT * FROM `article` WHERE `id` < 480930 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005166s ]
0.120189s