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python爬虫实战案例视频+资料

  • 2026-07-02 18:53:47
python爬虫实战案例视频+资料

python爬虫实战案例视频+资料免费下载:

链接:https://pan.quark.cn/s/dc84b30eea70

# 练习1:

# 现有如下代码, 会输出什么:

class People(object):

      __name = "luffy"

      __age = 18

p1 = People()

#查询私有属性(违规操作)

# print(p1.__name, p1.__age)

#练习2:

#编写程序, 编写一个学生类, 要求有一个计数器的属性, 统计总共实例化了多少个学生.

class Student :

    #记录创建多少个学生的变量

    __count = 0

    def __init__(self,name,age):

        self.name = name

        self.age = age

        Student.__count +=1

        #实例化一下

    @staticmethod

    def tell_count():

        print("总共实例化了%s人",Student.__count)

student1 = Student("xiaoming",22)

student2 = Student("xiaohong",25)

Student.tell_count()

#练习3:

#编写程序, A 继承了 B, 俩个类都实现了 handle 方法, 在 A 中的 handle 方法中调用 B 的 handle 方法

class B:

    def handle(self):

        print("这是B类的handle方法")

class A(B):

    #super响应着链

    def handle(self):

        print("这是A类的handle方法")

a = A()

a.handle()

#练习4:

#模仿王者荣耀定义两个英雄类

#要求:

#

#英雄需要有昵称、攻击力、生命值等属性;

#实例化出两个英雄对象;

#英雄之间可以互殴,被殴打的一方掉血,血量小于0则判定为死亡(提示:这里是函数)

class Hero:

    #aggresivty攻击力

    def __init__(self,nick_name,life_value,aggresivty):

        self.nick_name = nick_name

        self.life_value = life_value

        self.aaa = aggresivty

    def attack(self, enemy):

            #减血的方法

            enemy.life_value -= self.aaa

#英雄联盟

class Garen(Hero):

    pass

class Riven(Hero):

    pass

g1 = Garen("盖伦",100,20)

r1 = Riven("放逐之刃",80,25)

g1.attack(g1)

print(g1.life_value)

#练习5:

#请编写一段符合多态特性的代码.

#没有类型关注的是同一个方法

# 练习6:下面三种实现单例的方法,哪一种写法是正确的,为什么多线程

class Single(object):

    __instance = None

    def __new__(cls):

        if not cls.__instance:

        #写法一

            # cls.__instance = Single() #

            # 写法二

            cls.__instance = super(Single, cls).__new__(cls)

            # 写法三

            #直接调用父类的方法

            cls.__instance = object.__new__(cls)

        return cls.__instance

A = Single()

B = Single()

print(id(A))

print(id(B))

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  1. CONNECT:[ UseTime:0.000632s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000801s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000293s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000266s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000471s ]
  6. SELECT * FROM `set` [ RunTime:0.000201s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000561s ]
  8. SELECT * FROM `article` WHERE `id` = 488863 LIMIT 1 [ RunTime:0.000387s ]
  9. UPDATE `article` SET `lasttime` = 1783144535 WHERE `id` = 488863 [ RunTime:0.021980s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000413s ]
  11. SELECT * FROM `article` WHERE `id` < 488863 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000627s ]
  12. SELECT * FROM `article` WHERE `id` > 488863 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000509s ]
  13. SELECT * FROM `article` WHERE `id` < 488863 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000968s ]
  14. SELECT * FROM `article` WHERE `id` < 488863 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002208s ]
  15. SELECT * FROM `article` WHERE `id` < 488863 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004744s ]
0.107097s