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Python if 判断:从"要不要做"到"做哪个"

  • 2026-08-23 07:31:12
Python if 判断:从"要不要做"到"做哪个"

Python if 判断:从"要不要做"到"做哪个"

写程序就是在做决策:用户年龄够不够?密码对不对?分数属于哪个等级?

Python 的 ifelifelse 就是用来做这些决策的。语法很简单,但真正写代码的时候,怎么把逻辑组织清楚、怎么避免常见问题,还是有些门道。

最简单的:if,一件事要不要做

age = 18

if age >= 18:
    print("已成年")

if 后面的条件成立了,就执行缩进的代码块;不成立,跳过。

条件就是一个"真或假"的问题——比较运算(><==)、逻辑运算(andornot)、成员运算(in)都可以放在 if 后面。

# 比较
if score >= 60:
    print("及格")

# 逻辑组合
if age >= 18and has_id:
    print("可以办理")

# 成员判断
if city in ["北京""上海""广州"]:
    print("一线城市")

二选一:if-else,两条路走一条

一件事,成立走 A,不成立走 B。

# 预设正确密码
correct_password = "python123"

# 接收用户输入
user_input = input("请输入密码:")

# 判断密码是否正确
if user_input == correct_password:
    print("密码正确,登录成功!")
else:
    print("密码错误,请重新输入!")

if 和 else 必然执行其中一个,没有第三种情况。

注意 = 和 == 的区别

  • = 是赋值,x = 5 把 5 赋给 x
  • == 是比较,x == 5 判断 x 是否等于 5

把 == 写成 =,在 Python 里会直接报语法错误,不像某些语言那样悄悄把条件变成赋值。

多选一:if-elif-else,多个条件按顺序判

当你有三个以上分支的时候,用 elif(else if 的缩写)。

# 定义分数(0-100)
score = 85

# 多条件判断评级
if score >= 90:
    print("评级:优秀")
elif score >= 80:  # 隐含条件:score < 90
    print("评级:良好")
elif score >= 60:  # 隐含条件:score < 80
    print("评级:及格")
else:  # 隐含条件:score < 60
    print("评级:不及格")

执行逻辑:从上往下判断,碰到第一个成立的就执行,然后整段结束。 后面的条件不会再看了。

再复杂一点:嵌套判断,大条件里套小条件

有时候需要"先满足一个条件,再看另一个条件"。

# 定义用户信息
user_role = "admin"# 角色:admin(管理员)、user(普通用户)
is_active = True# 账号是否激活:True(激活)、False(未激活)

# 外层判断:账号是否激活
if is_active:
    print("账号已激活,正在验证权限...")
# 内层判断:用户角色是否为管理员
if user_role == "admin":
        print("管理员身份,拥有全部操作权限")
else:
        print("普通用户身份,拥有查看权限")
else:
    print("账号未激活,请先激活账号!")

嵌套的逻辑是清晰的,但不建议超过三层——三层以上眼睛就花了,后期改代码也容易出错。

嵌套太多怎么办?用"提前返回"把它拉平:

# 扁平化写法,逻辑更清楚
ifnot is_active:
    print("账号未激活")
return

print("账号已激活")
if role == "admin":
    print("管理员,全部权限")
else:
    print("普通用户,查看权限")

关键:非布尔值的 “隐式转换”

Python 中,非布尔值作为条件时,会自动转换为布尔值(True 或 False),转换规则:

  • 转为 False 的情况00.0None、空字符串("")、空列表([])、空字典({})、空元组(());
  • 转为 True 的情况:非 0 数字、非空字符串、非空容器(列表 / 字典 / 元组)、True

示例:利用非空判断简化代码

# 定义一个列表(存储用户购物车)
cart = ["苹果""香蕉"]

# 简化判断:无需写 len(cart) > 0,直接判断列表是否非空
if cart:
    print(f"购物车中有 {len(cart)} 件商品:{cart}")
else:
    print("购物车为空,请添加商品")

运行结果

购物车中有 2 件商品:['苹果', '香蕉']

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  1. CONNECT:[ UseTime:0.001242s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001893s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.019080s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.012814s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001755s ]
  6. SELECT * FROM `set` [ RunTime:0.013722s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001868s ]
  8. SELECT * FROM `article` WHERE `id` = 511901 LIMIT 1 [ RunTime:0.030140s ]
  9. UPDATE `article` SET `lasttime` = 1787484635 WHERE `id` = 511901 [ RunTime:0.021912s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.003590s ]
  11. SELECT * FROM `article` WHERE `id` < 511901 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.016942s ]
  12. SELECT * FROM `article` WHERE `id` > 511901 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006863s ]
  13. SELECT * FROM `article` WHERE `id` < 511901 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.051331s ]
  14. SELECT * FROM `article` WHERE `id` < 511901 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.085583s ]
  15. SELECT * FROM `article` WHERE `id` < 511901 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005455s ]
0.460690s