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Python流程控制

  • 2026-01-15 02:51:25
Python流程控制

流程控制指的是程序中指令执行的顺序,即决定哪条语句什么时候执行。默认情况下代码是从上往下一行一行执行,但加入控制结构后,程序可以:

  • 按条件分支执行不同代码

  • 循环重复执行某段代码

这些改变正常顺序的行为统称为流程控制。

条件判断(Conditional Statements)

条件判断用于根据条件的真值(True/False)来控制程序执行哪一段代码。

if 语句

基本结构:

if condition:
# 条件为 True 时执行

示例:

x = 10
if x > 5:
    print("x 大于 5")

if — else 语句

基本结构:

if condition:
# 条件为 True 时执行
else:
# 当条件为 False 时执行另一段代码

示例:

age = 16
if age >= 18:
    print("成年")
else:
    print("未成年")

if — elif — else(多分支)

elif 是 “else if” 的缩写,用于添加多个条件判断:

基本结构:

if condition:
# 条件为 True 时执行
elif condition:
# 前一个条件不满足时,且当前条件满足
else:
# 当条件为 False 时执行另一段代码

示例:

score = 75
if score >= 90:
    print("优秀")
elif score >= 60:
    print("及格")
else:
    print("不及格")

当第一个条件满足时,后续 elif 和 else 都不会再判断

循环结构

循环可以重复执行一段代码,直到特定条件满足或序列结束。

for 循环

for 用于遍历序列(如列表、字符串、range 等):

基本结构:

for 变量 in 可迭代对象:
# 每次循环要执行的代码块

else:
# 循环结束以后执行逻辑

示例:

# 遍历 range ,range 用于产生列表
for i in range(5):
    print(i)

# 遍历列表 -- 只遍历元素
fruits = ["apple""banana""cherry"]
for fruit in fruits:
    print(fruit)


# 同时获取索引和元素  enumerate(fruits) 会返回一个可迭代的对象,每次迭代返回一个 (index, value) 二元组
for index, fruit in enumerate(fruits):
    print(index, fruit)


# 遍历 dict
person = {"name""Alice""age"30"city""Beijing"}

# 遍历 dict 键 key   
for key in person:   # 等同于     for key in person.keys():
    print(key)

#  遍历值
for value in person.values():
    print(value)


# 遍历键 + 值
for key, value in person.items():
    print(key, value)


# for else
for i in range(5):
    print(i)
else:
    print("Loop completed")
# 输出 0 1 2 3 4 Loop completed

while 循环

while 会只要条件为真就一直执行:

基本结构:

while condition:
# 需要在循环体中修改condition,使condition可以变为False,终止循环
else:
# 循环结束以后执行逻辑


whileTrue:
# 默认为死循环
count = 1
while count <= 3:
    print(count)
    count += 1
else:
    print("count = ", count)

输出:

1
2
3
count =  4

注意要在循环内修改条件,否则可能变成无限循环

循环跳转控制语句(Loop Control)

Python 提供一些关键字来改变循环执行的流程:breakcontinue 和 pass

break — 提前退出循环

break 会 立刻停止当前循环(包括 for 和 while),不再执行后续的循环判断:

for i in range(5):
if i == 3:
break
    print(i)

输出:

0
1
2

循环当 i == 3 时被打断,后面的值不再输出。

continue — 跳过本次迭代

continue 会跳过当前循环剩余的代码,直接进行下一次循环continue不会中断循环,而是在循环内部判断条件满足时,跳过后续逻辑的执行:

for i in range(5):
if i == 2:
continue
    print(i)

输出:

0
1
3
4

当 i == 2 时跳过打印。

pass — 空操作(占位符)

pass 什么都不做,只是为了语法上保持结构有效:

for i in range(3):
if i == 1:
pass# 占位
    print(i)

输出:

0
1
2

pass 常用于函数体、类体等暂时未实现的地方

match匹配

match语句接受一个表达式并把它的值与一个或多个 case 块给出的一系列模式进行比较。只有第一个匹配的模式会被执行,并且它还可以提取值的组成部分(序列的元素或对象的属性)赋给变量。如果没有匹配的case,则不执行任何分支。

简单结构:

  • 用 | 将多个字面值组合到一个模式中
  • _作为通配符 ,所有case不匹配时,执行的逻辑
  • return 的使用,需要将match作为函数的返回
  • 可以用来匹配 常量值 枚举(Enum) 和 类(Class)

函数、枚举和类后续讲解

match expression:
    case condition | condition:
return value;  
    case condition:
# 业务逻辑,无结果返回
    case _:
# 默认处理,无任何case匹配时

示例:

import random

rad = random.randint(010)
match rad:
    case 0 | 12:
        print("Low")
    case 3 | 4 :
        print("Medium")
    case _:
        print("High")    

匹配类时,可以将匹配结果绑定到类属性,同时可以通过 if 增加守卫子句(需要满足if条件)

match 类实例:
    case 类(属性) if 条件:
# 逻辑
    case 类(属性):
# 逻辑

自定义类需要在类中设置特殊属性 __match_args__,为属性指定其在match模式中对应的位置。若设为 ("x", "y"),则以下模式相互等价(且都把属性 y 绑定到变量 var

Point(1, var)
Point(1, y=var)
Point(x=1, y=var)
Point(y=var, x=1)

如果不设置__match_args__会报如下错误:

TypeError: Point() accepts 0 positional sub-patterns (2 given)

示例:

classPoint:
    __match_args__ = ('x''y')
def__init__(self, x, y):
        self.x = x
        self.y = y

point = Point(05)

match point:
    case Point(x, y) if x == y:
        print(f"Y=X at {x}")
    case Point(x, y):
        print(f"Not on the diagonal")

匹配枚举Enum

from enum import Enum
classColor(Enum):
    RED = 'red'
    GREEN = 'green'
    BLUE = 'blue'

# 可以修改 color 实例的值观察 match 模式匹配的输出
#color = Color.BLUE
color = Color.RED

match color:
    case Color.RED:
        print("I see red!")
    case Color.GREEN:
        print("Grass is green")
    case Color.BLUE:
        print("I'm feeling the blues :(")

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  1. CONNECT:[ UseTime:0.000460s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000550s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000868s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007740s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000611s ]
  6. SELECT * FROM `set` [ RunTime:0.002913s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000743s ]
  8. SELECT * FROM `article` WHERE `id` = 460998 LIMIT 1 [ RunTime:0.011746s ]
  9. UPDATE `article` SET `lasttime` = 1770563240 WHERE `id` = 460998 [ RunTime:0.001380s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.001895s ]
  11. SELECT * FROM `article` WHERE `id` < 460998 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001073s ]
  12. SELECT * FROM `article` WHERE `id` > 460998 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.011665s ]
  13. SELECT * FROM `article` WHERE `id` < 460998 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.019528s ]
  14. SELECT * FROM `article` WHERE `id` < 460998 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.059723s ]
  15. SELECT * FROM `article` WHERE `id` < 460998 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.060978s ]
0.351020s