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Python算术运算符详解

  • 2026-03-27 12:36:18
Python算术运算符详解
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📚 前言

算术运算符是Python编程的基础,掌握它们对于编写高效的代码至关重要。本文将详细介绍Python中的算术运算符,并通过丰富的实例帮助您深入理解。


🔢 Python算术运算符一览表

运算符名称描述示例
+加法两个数相加3 + 5 = 8
-减法两个数相减10 - 4 = 6
*乘法两个数相乘6 * 7 = 42
/除法两个数相除(结果为浮点数)15 / 3 = 5.0
//整除两个数相除,向下取整17 // 5 = 3
%取模返回除法的余数17 % 5 = 2
**幂运算返回x的y次幂2 ** 3 = 8

📝 详细讲解与实例

1️⃣ 加法运算符 (+)

# 数字相加
a=10
b=20
result=a+b
print(f"{a} + {b} = {result}")  # 输出: 10 + 20 = 30

# 字符串拼接(+的特殊用法)
str1="Hello"
str2="World"
print(str1+" "+str2)  # 输出: Hello World

2️⃣ 减法运算符 (-)

# 数字相减
x=50
y=30
print(f"{x} - {y} = {x-y}")  # 输出: 50 - 30 = 20

# 负数表示
temperature=-5
print(f"当前温度: {temperature}°C")  # 输出: 当前温度: -5°C

3️⃣ 乘法运算符 (*)

# 数字相乘
price=25.5
quantity=3
total=price*quantity
print(f"总价: ¥{total}")  # 输出: 总价: ¥76.5

# 字符串重复(*的特殊用法)
message="Python"
print(message*3)  # 输出: PythonPythonPython

4️⃣ 除法运算符 (/)

# 普通除法(总是返回浮点数)
pizza=8
people=3
per_person=pizza/people
print(f"每人分到: {per_person} 片披萨")  # 输出: 每人分到: 2.6666666666666665 片披萨

# 注意:除数不能为0
# print(10 / 0)  # 会抛出 ZeroDivisionError

5️⃣ 整除运算符 (//)

# 向下取整除法
total_candies=17
children=5
candies_per_child=total_candies//children
remaining=total_candies%children
print(f"{total_candies}颗糖分给{children}个小朋友:")
print(f"每人分到: {candies_per_child}颗")  # 输出: 每人分到: 3颗
print(f"剩余: {remaining}颗")  # 输出: 剩余: 2颗

6️⃣ 取模运算符 (%)

# 判断奇偶数
number=27
ifnumber%2==0:
print(f"{number} 是偶数")
else:
print(f"{number} 是奇数")  # 输出: 27 是奇数

# 循环计数器
foriinrange(111):
ifi%3==0:
print(f"{i} 是3的倍数")

7️⃣ 幂运算 (**)

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

# 计算复利
principal=10000# 本金
rate=0.05# 年利率
years=3# 年数
amount=principal* (1+rate**years
print(f"{years}年后的金额: ¥{amount:.2f}")  # 输出: 3年后的金额: ¥11576.25

🎯 综合实例:简单计算器

defsimple_calculator():
print("=== Python简单计算器 ===")

# 获取用户输入
num1=float(input("请输入第一个数字: "))
operator=input("请选择运算符 (+, -, *, /, //, %, **): ")
num2=float(input("请输入第二个数字: "))

# 执行运算
ifoperator=='+':
result=num1+num2
elifoperator=='-':
result=num1-num2
elifoperator=='*':
result=num1*num2
elifoperator=='/':
ifnum2!=0:
result=num1/num2
else:
print("错误:除数不能为0!")
return
elifoperator=='//':
ifnum2!=0:
result=num1//num2
else:
print("错误:除数不能为0!")
return
elifoperator=='%':
ifnum2!=0:
result=num1%num2
else:
print("错误:除数不能为0!")
return
elifoperator=='**':
result=num1**num2
else:
print("错误:无效的运算符!")
return

print(f"计算结果: {num1}{operator}{num2} = {result}")

# 运行计算器
simple_calculator()

💡 实用技巧

1. 运算符优先级

# 优先级从高到低: ** → *, /, //, % → +, -
expression=2+3*4**2-8/4
print(f"2 + 3 * 4 ** 2 - 8 / 4 = {expression}")
# 计算步骤: 4**2=16 → 3*16=48 → 8/4=2 → 2+48-2=48

2. 复合赋值运算符

# 等同于: count = count + 1
count=10
count+=5# count = 15
count-=3# count = 12
count*=2# count = 24
count//=4# count = 6
count**=2# count = 36

3. 实际应用场景

# 购物车计算
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}
]

total=0
foriteminitems:
subtotal=item["price"*item["quantity"]
total+=subtotal
print(f"{item['name']}: ¥{item['price']} × {item['quantity']} = ¥{subtotal}")

print(f"总计: ¥{total}")

🎓 总结

Python的算术运算符虽然简单,但功能强大。掌握这些基础知识,您就能:

  • ✅ 进行各种数学计算

  • ✅ 处理字符串操作

  • ✅ 编写实用的程序逻辑

  • ✅ 为更复杂的编程概念打下基础

记住:编程是一门实践性很强的技能,多动手练习才能真正掌握!


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  1. CONNECT:[ UseTime:0.000593s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000683s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000290s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000298s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000520s ]
  6. SELECT * FROM `set` [ RunTime:0.000202s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000507s ]
  8. SELECT * FROM `article` WHERE `id` = 480675 LIMIT 1 [ RunTime:0.000987s ]
  9. UPDATE `article` SET `lasttime` = 1774587984 WHERE `id` = 480675 [ RunTime:0.010400s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000740s ]
  11. SELECT * FROM `article` WHERE `id` < 480675 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001095s ]
  12. SELECT * FROM `article` WHERE `id` > 480675 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001001s ]
  13. SELECT * FROM `article` WHERE `id` < 480675 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001829s ]
  14. SELECT * FROM `article` WHERE `id` < 480675 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002108s ]
  15. SELECT * FROM `article` WHERE `id` < 480675 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006740s ]
0.112196s