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2 - 基础

作者:互联网

本节内容

  1. 列表、元组操作
  2. 字符串操作
  3. 字典操作
  4. 集合操作
  5. 文件操作
  6. 字符编码与转码 

1. 列表、元组操作

列表是我们最以后最常用的数据类型之一,通过列表可以对数据实现最方便的存储、修改等操作

定义列表

?
1names = ['Alex',"Tenglan",'Eric']

通过下标访问列表中的元素,下标从0开始计数

?
12345678>>> names[0]'Alex'>>> names[2]'Eric'>>> names[-1]'Eric'>>> names[-2] #还可以倒着取'Tenglan'

切片:取多个元素  

>>> names = ["Alex","Tenglan","Eric","Rain","Tom","Amy"]
>>> names[1:4]  #取下标1至下标4之间的数字,包括1,不包括4
['Tenglan', 'Eric', 'Rain']
>>> names[1:-1] #取下标1至-1的值,不包括-1
['Tenglan', 'Eric', 'Rain', 'Tom']
>>> names[0:3] 
['Alex', 'Tenglan', 'Eric']
>>> names[:3] #如果是从头开始取,0可以忽略,跟上句效果一样
['Alex', 'Tenglan', 'Eric']
>>> names[3:] #如果想取最后一个,必须不能写-1,只能这么写
['Rain', 'Tom', 'Amy'] 
>>> names[3:-1] #这样-1就不会被包含了
['Rain', 'Tom']
>>> names[0::2] #后面的2是代表,每隔一个元素,就取一个
['Alex', 'Eric', 'Tom'] 
>>> names[::2] #和上句效果一样
['Alex', 'Eric', 'Tom']
View Code

追加

>>> names
['Alex', 'Tenglan', 'Eric', 'Rain', 'Tom', 'Amy']
>>> names.append("我是新来的")
>>> names
['Alex', 'Tenglan', 'Eric', 'Rain', 'Tom', 'Amy', '我是新来的']
View Code

插入

>>> names
['Alex', 'Tenglan', 'Eric', 'Rain', 'Tom', 'Amy', '我是新来的']
>>> names.insert(2,"强行从Eric前面插入")
>>> names
['Alex', 'Tenglan', '强行从Eric前面插入', 'Eric', 'Rain', 'Tom', 'Amy', '我是新来的']

>>> names.insert(5,"从eric后面插入试试新姿势")
>>> names
['Alex', 'Tenglan', '强行从Eric前面插入', 'Eric', 'Rain', '从eric后面插入试试新姿势', 'Tom', 'Amy', '我是新来的']
View Code

修改

>>> names
['Alex', 'Tenglan', '强行从Eric前面插入', 'Eric', 'Rain', '从eric后面插入试试新姿势', 'Tom', 'Amy', '我是新来的']
>>> names[2] = "该换人了"
>>> names
['Alex', 'Tenglan', '该换人了', 'Eric', 'Rain', '从eric后面插入试试新姿势', 'Tom', 'Amy', '我是新来的']
View Code

删除

>>> del names[2] 
>>> names
['Alex', 'Tenglan', 'Eric', 'Rain', '从eric后面插入试试新姿势', 'Tom', 'Amy', '我是新来的']
>>> del names[4]
>>> names
['Alex', 'Tenglan', 'Eric', 'Rain', 'Tom', 'Amy', '我是新来的']
>>> 
>>> names.remove("Eric") #删除指定元素
>>> names
['Alex', 'Tenglan', 'Rain', 'Tom', 'Amy', '我是新来的']
>>> names.pop() #删除列表最后一个值 
'我是新来的'
>>> names
['Alex', 'Tenglan', 'Rain', 'Tom', 'Amy']
View Code

扩展

>>> names
['Alex', 'Tenglan', 'Rain', 'Tom', 'Amy']
>>> b = [1,2,3]
>>> names.extend(b)
>>> names
['Alex', 'Tenglan', 'Rain', 'Tom', 'Amy', 1, 2, 3]
View Code

拷贝

>>> names
['Alex', 'Tenglan', 'Rain', 'Tom', 'Amy', 1, 2, 3]

>>> name_copy = names.copy()
>>> name_copy
['Alex', 'Tenglan', 'Rain', 'Tom', 'Amy', 1, 2, 3]
View Code

copy真的这么简单么?那我还讲个屁。。。

统计

>>> names
['Alex', 'Tenglan', 'Amy', 'Tom', 'Amy', 1, 2, 3]
>>> names.count("Amy")
2
View Code

排序&翻转

>>> names
['Alex', 'Tenglan', 'Amy', 'Tom', 'Amy', 1, 2, 3]
>>> names.sort() #排序
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unorderable types: int() < str()   #3.0里不同数据类型不能放在一起排序了,擦
>>> names[-3] = '1'
>>> names[-2] = '2'
>>> names[-1] = '3'
>>> names
['Alex', 'Amy', 'Amy', 'Tenglan', 'Tom', '1', '2', '3']
>>> names.sort()
>>> names
['1', '2', '3', 'Alex', 'Amy', 'Amy', 'Tenglan', 'Tom']

>>> names.reverse() #反转
>>> names
['Tom', 'Tenglan', 'Amy', 'Amy', 'Alex', '3', '2', '1']
View Code

获取下标

>>> names
['Tom', 'Tenglan', 'Amy', 'Amy', 'Alex', '3', '2', '1']
>>> names.index("Amy")
2 #只返回找到的第一个下标
View Code

元组

元组其实跟列表差不多,也是存一组数,只不是它一旦创建,便不能再修改,所以又叫只读列表

语法

?
1names = ("alex","jack","eric")

它只有2个方法,一个是count,一个是index,完毕。  

程序练习 

请闭眼写出以下程序。

程序:购物车程序

需求:

  1. 启动程序后,让用户输入工资,然后打印商品列表
  2. 允许用户根据商品编号购买商品
  3. 用户选择商品后,检测余额是否够,够就直接扣款,不够就提醒 
  4. 可随时退出,退出时,打印已购买商品和余额

 

2. 字符串操作   

特性:不可修改 

复制代码
name.capitalize()  首字母大写
name.casefold()   大写全部变小写
name.center(50,"-")  输出 '---------------------Alex Li----------------------'
name.count('lex') 统计 lex出现次数
name.encode()  将字符串编码成bytes格式
name.endswith("Li")  判断字符串是否以 Li结尾
 "Alex\tLi".expandtabs(10) 输出'Alex      Li', 将\t转换成多长的空格 
 name.find('A')  查找A,找到返回其索引, 找不到返回-1 

format :
    >>> msg = "my name is {}, and age is {}"
    >>> msg.format("alex",22)
    'my name is alex, and age is 22'
    >>> msg = "my name is {1}, and age is {0}"
    >>> msg.format("alex",22)
    'my name is 22, and age is alex'
    >>> msg = "my name is {name}, and age is {age}"
    >>> msg.format(age=22,name="ale")
    'my name is ale, and age is 22'
format_map
    >>> msg.format_map({'name':'alex','age':22})
    'my name is alex, and age is 22'


msg.index('a')  返回a所在字符串的索引
'9aA'.isalnum()   True

'9'.isdigit() 是否整数
name.isnumeric  
name.isprintable
name.isspace
name.istitle
name.isupper
 "|".join(['alex','jack','rain'])
'alex|jack|rain'


maketrans
    >>> intab = "aeiou"  #This is the string having actual characters. 
    >>> outtab = "12345" #This is the string having corresponding mapping character
    >>> trantab = str.maketrans(intab, outtab)
    >>> 
    >>> str = "this is string example....wow!!!"
    >>> str.translate(trantab)
    'th3s 3s str3ng 2x1mpl2....w4w!!!'

 msg.partition('is')   输出 ('my name ', 'is', ' {name}, and age is {age}') 

 >>> "alex li, chinese name is lijie".replace("li","LI",1)
     'alex LI, chinese name is lijie'

 msg.swapcase 大小写互换


 >>> msg.zfill(40)
'00000my name is {name}, and age is {age}'



>>> n4.ljust(40,"-")
'Hello 2orld-----------------------------'
>>> n4.rjust(40,"-")
'-----------------------------Hello 2orld'


>>> b="ddefdsdff_哈哈" 
>>> b.isidentifier() #检测一段字符串可否被当作标志符,即是否符合变量命名规则
True
复制代码

 

 

3. 字典操作

字典一种key - value 的数据类型,使用就像我们上学用的字典,通过笔划、字母来查对应页的详细内容。

语法:

info = {
    'stu1101': "TengLan Wu",
    'stu1102': "LongZe Luola",
    'stu1103': "XiaoZe Maliya",
}

字典的特性:

增加

>>> info["stu1104"] = "苍井空"
>>> info
{'stu1102': 'LongZe Luola', 'stu1104': '苍井空', 'stu1103': 'XiaoZe Maliya', 'stu1101': 'TengLan Wu'}
View Code

修改

>>> info['stu1101'] = "武藤兰"
>>> info
{'stu1102': 'LongZe Luola', 'stu1103': 'XiaoZe Maliya', 'stu1101': '武藤兰'}
View Code

删除

>>> info
{'stu1102': 'LongZe Luola', 'stu1103': 'XiaoZe Maliya', 'stu1101': '武藤兰'}
>>> info.pop("stu1101") #标准删除姿势
'武藤兰'
>>> info
{'stu1102': 'LongZe Luola', 'stu1103': 'XiaoZe Maliya'}
>>> del info['stu1103'] #换个姿势删除
>>> info
{'stu1102': 'LongZe Luola'}
>>> 
>>> 
>>> 
>>> info = {'stu1102': 'LongZe Luola', 'stu1103': 'XiaoZe Maliya'}
>>> info
{'stu1102': 'LongZe Luola', 'stu1103': 'XiaoZe Maliya'} #随机删除
>>> info.popitem()
('stu1102', 'LongZe Luola')
>>> info
{'stu1103': 'XiaoZe Maliya'}
View Code

查找

>>> info = {'stu1102': 'LongZe Luola', 'stu1103': 'XiaoZe Maliya'}
>>> 
>>> "stu1102" in info #标准用法
True
>>> info.get("stu1102")  #获取
'LongZe Luola'
>>> info["stu1102"] #同上,但是看下面
'LongZe Luola'
>>> info["stu1105"]  #如果一个key不存在,就报错,get不会,不存在只返回None
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
KeyError: 'stu1105'
View Code

多级字典嵌套及操作

av_catalog = {
    "欧美":{
        "www.youporn.com": ["很多免费的,世界最大的","质量一般"],
        "www.pornhub.com": ["很多免费的,也很大","质量比yourporn高点"],
        "letmedothistoyou.com": ["多是自拍,高质量图片很多","资源不多,更新慢"],
        "x-art.com":["质量很高,真的很高","全部收费,屌比请绕过"]
    },
    "日韩":{
        "tokyo-hot":["质量怎样不清楚,个人已经不喜欢日韩范了","听说是收费的"]
    },
    "大陆":{
        "1024":["全部免费,真好,好人一生平安","服务器在国外,慢"]
    }
}

av_catalog["大陆"]["1024"][1] += ",可以用爬虫爬下来"
print(av_catalog["大陆"]["1024"])
#ouput 
['全部免费,真好,好人一生平安', '服务器在国外,慢,可以用爬虫爬下来']
View Code

 

其它姿势

#values
>>> info.values()
dict_values(['LongZe Luola', 'XiaoZe Maliya'])

#keys
>>> info.keys()
dict_keys(['stu1102', 'stu1103'])


#setdefault
>>> info.setdefault("stu1106","Alex")
'Alex'
>>> info
{'stu1102': 'LongZe Luola', 'stu1103': 'XiaoZe Maliya', 'stu1106': 'Alex'}
>>> info.setdefault("stu1102","龙泽萝拉")
'LongZe Luola'
>>> info
{'stu1102': 'LongZe Luola', 'stu1103': 'XiaoZe Maliya', 'stu1106': 'Alex'}


#update 
>>> info
{'stu1102': 'LongZe Luola', 'stu1103': 'XiaoZe Maliya', 'stu1106': 'Alex'}
>>> b = {1:2,3:4, "stu1102":"龙泽萝拉"}
>>> info.update(b)
>>> info
{'stu1102': '龙泽萝拉', 1: 2, 3: 4, 'stu1103': 'XiaoZe Maliya', 'stu1106': 'Alex'}

#items
info.items()
dict_items([('stu1102', '龙泽萝拉'), (1, 2), (3, 4), ('stu1103', 'XiaoZe Maliya'), ('stu1106', 'Alex')])


#通过一个列表生成默认dict,有个没办法解释的坑,少用吧这个
>>> dict.fromkeys([1,2,3],'testd')
{1: 'testd', 2: 'testd', 3: 'testd'}
View Code

循环dict 

复制代码
#方法1
for key in info:
    print(key,info[key])

#方法2
for k,v in info.items(): #会先把dict转成list,数据里大时莫用
    print(k,v)
复制代码

程序练习

程序: 三级菜单

要求: 

  1. 打印省、市、县三级菜单
  2. 可返回上一级
  3. 可随时退出程序

 

menu = {
    '北京':{
        '海淀':{
            '五道口':{
                'soho':{},
                '网易':{},
                'google':{}
            },
            '中关村':{
                '爱奇艺':{},
                '汽车之家':{},
                'youku':{},
            },
            '上地':{
                '百度':{},
            },
        },
        '昌平':{
            '沙河':{
                '老男孩':{},
                '北航':{},
            },
            '天通苑':{},
            '回龙观':{},
        },
        '朝阳':{},
        '东城':{},
    },
    '上海':{
        '闵行':{
            "人民广场":{
                '炸鸡店':{}
            }
        },
        '闸北':{
            '火车战':{
                '携程':{}
            }
        },
        '浦东':{},
    },
    '山东':{},
}


exit_flag = False
current_layer = menu

layers = [menu]

while not  exit_flag:
    for k in current_layer:
        print(k)
    choice = input(">>:").strip()
    if choice == "b":
        current_layer = layers[-1]
        #print("change to laster", current_layer)
        layers.pop()
    elif choice not  in current_layer:continue
    else:
        layers.append(current_layer)
        current_layer = current_layer[choice]
三年菜单文艺青年版

 

 

4.集合操作

集合是一个无序的,不重复的数据组合,它的主要作用如下:

常用操作

s = set([3,5,9,10])      #创建一个数值集合  
  
t = set("Hello")         #创建一个唯一字符的集合  


a = t | s          # t 和 s的并集  
  
b = t & s          # t 和 s的交集  
  
c = t – s          # 求差集(项在t中,但不在s中)  
  
d = t ^ s          # 对称差集(项在t或s中,但不会同时出现在二者中)  
  
   
  
基本操作:  
  
t.add('x')            # 添加一项  
  
s.update([10,37,42])  # 在s中添加多项  
  
   
  
使用remove()可以删除一项:  
  
t.remove('H')  
  
  
len(s)  
set 的长度  
  
x in s  
测试 x 是否是 s 的成员  
  
x not in s  
测试 x 是否不是 s 的成员  
  
s.issubset(t)  
s <= t  
测试是否 s 中的每一个元素都在 t 中  
  
s.issuperset(t)  
s >= t  
测试是否 t 中的每一个元素都在 s 中  
  
s.union(t)  
s | t  
返回一个新的 set 包含 s 和 t 中的每一个元素  
  
s.intersection(t)  
s & t  
返回一个新的 set 包含 s 和 t 中的公共元素  
  
s.difference(t)  
s - t  
返回一个新的 set 包含 s 中有但是 t 中没有的元素  
  
s.symmetric_difference(t)  
s ^ t  
返回一个新的 set 包含 s 和 t 中不重复的元素  
  
s.copy()  
返回 set “s”的一个浅复制  
View Code

 

5. 文件操作

对文件操作流程

  1. 打开文件,得到文件句柄并赋值给一个变量
  2. 通过句柄对文件进行操作
  3. 关闭文件 

现有文件如下 

+ View Code?
12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364Somehow, it seems the love I knew was always the most destructive kind不知为何,我经历的爱情总是最具毁灭性的的那种Yesterday when I was young昨日当我年少轻狂The taste of life was sweet生命的滋味是甜的As rain upon my tongue就如舌尖上的雨露I teased at life as if it were a foolish game我戏弄生命 视其为愚蠢的游戏The way the evening breeze就如夜晚的微风May tease the candle flame逗弄蜡烛的火苗The thousand dreams I dreamed我曾千万次梦见The splendid things I planned那些我计划的绚丽蓝图I always built to last on weak and shifting sand但我总是将之建筑在易逝的流沙上I lived by night and shunned the naked light of day我夜夜笙歌 逃避白昼赤裸的阳光And only now I see how the time ran away事到如今我才看清岁月是如何匆匆流逝Yesterday when I was young昨日当我年少轻狂So many lovely songs were waiting to be sung有那么多甜美的曲儿等我歌唱So many wild pleasures lay in store for me有那么多肆意的快乐等我享受And so much pain my eyes refused to see还有那么多痛苦 我的双眼却视而不见I ran so fast that time and youth at last ran out我飞快地奔走 最终时光与青春消逝殆尽I never stopped to think what life was all about我从未停下脚步去思考生命的意义And every conversation that I can now recall如今回想起的所有对话Concerned itself with me and nothing else at all除了和我相关的 什么都记不得了The game of love I played with arrogance and pride我用自负和傲慢玩着爱情的游戏And every flame I lit too quickly, quickly died所有我点燃的火焰都熄灭得太快The friends I made all somehow seemed to slip away所有我交的朋友似乎都不知不觉地离开了And only now I'm left alone to end the play, yeah只剩我一个人在台上来结束这场闹剧Oh, yesterday when I was young噢 昨日当我年少轻狂So many, many songs were waiting to be sung有那么那么多甜美的曲儿等我歌唱So many wild pleasures lay in store for me有那么多肆意的快乐等我享受And so much pain my eyes refused to see还有那么多痛苦 我的双眼却视而不见There are so many songs in me that won't be sung我有太多歌曲永远不会被唱起I feel the bitter taste of tears upon my tongue我尝到了舌尖泪水的苦涩滋味The time has come for me to pay for yesterday终于到了付出代价的时间 为了昨日When I was young当我年少轻狂

基本操作  

?
12345678f = open('lyrics') #打开文件first_line = f.readline()print('first line:',first_line) #读一行print('我是分隔线'.center(50,'-'))data = f.read()# 读取剩下的所有内容,文件大时不要用print(data) #打印文件 f.close() #关闭文件

打开文件的模式有:

"+" 表示可以同时读写某个文件

"U"表示在读取时,可以将 \r \n \r\n自动转换成 \n (与 r 或 r+ 模式同使用)

"b"表示处理二进制文件(如:FTP发送上传ISO镜像文件,linux可忽略,windows处理二进制文件时需标注)

其它语法

复制代码
    def close(self): # real signature unknown; restored from __doc__
        """
        Close the file.
        
        A closed file cannot be used for further I/O operations.  close() may be
        called more than once without error.
        """
        pass

    def fileno(self, *args, **kwargs): # real signature unknown
        """ Return the underlying file descriptor (an integer). """
        pass

    def isatty(self, *args, **kwargs): # real signature unknown
        """ True if the file is connected to a TTY device. """
        pass

    def read(self, size=-1): # known case of _io.FileIO.read
        """
        注意,不一定能全读回来
        Read at most size bytes, returned as bytes.
        
        Only makes one system call, so less data may be returned than requested.
        In non-blocking mode, returns None if no data is available.
        Return an empty bytes object at EOF.
        """
        return ""

    def readable(self, *args, **kwargs): # real signature unknown
        """ True if file was opened in a read mode. """
        pass

    def readall(self, *args, **kwargs): # real signature unknown
        """
        Read all data from the file, returned as bytes.
        
        In non-blocking mode, returns as much as is immediately available,
        or None if no data is available.  Return an empty bytes object at EOF.
        """
        pass

    def readinto(self): # real signature unknown; restored from __doc__
        """ Same as RawIOBase.readinto(). """
        pass #不要用,没人知道它是干嘛用的

    def seek(self, *args, **kwargs): # real signature unknown
        """
        Move to new file position and return the file position.
        
        Argument offset is a byte count.  Optional argument whence defaults to
        SEEK_SET or 0 (offset from start of file, offset should be >= 0); other values
        are SEEK_CUR or 1 (move relative to current position, positive or negative),
        and SEEK_END or 2 (move relative to end of file, usually negative, although
        many platforms allow seeking beyond the end of a file).
        
        Note that not all file objects are seekable.
        """
        pass

    def seekable(self, *args, **kwargs): # real signature unknown
        """ True if file supports random-access. """
        pass

    def tell(self, *args, **kwargs): # real signature unknown
        """
        Current file position.
        
        Can raise OSError for non seekable files.
        """
        pass

    def truncate(self, *args, **kwargs): # real signature unknown
        """
        Truncate the file to at most size bytes and return the truncated size.
        
        Size defaults to the current file position, as returned by tell().
        The current file position is changed to the value of size.
        """
        pass

    def writable(self, *args, **kwargs): # real signature unknown
        """ True if file was opened in a write mode. """
        pass

    def write(self, *args, **kwargs): # real signature unknown
        """
        Write bytes b to file, return number written.
        
        Only makes one system call, so not all of the data may be written.
        The number of bytes actually written is returned.  In non-blocking mode,
        returns None if the write would block.
        """
        pass
复制代码

with语句

为了避免打开文件后忘记关闭,可以通过管理上下文,即:

1 2 3 with open('log','r') as f:           ...

如此方式,当with代码块执行完毕时,内部会自动关闭并释放文件资源。

在Python 2.7 后,with又支持同时对多个文件的上下文进行管理,即:

1 2 with open('log1') as obj1, open('log2') as obj2:     pass

 

 

程序练习  

程序1: 实现简单的shell sed替换功能

程序2:修改haproxy配置文件 

需求:

1、查
    输入:www.oldboy.org
    获取当前backend下的所有记录

2、新建
    输入:
        arg = {
            'bakend': 'www.oldboy.org',
            'record':{
                'server': '100.1.7.9',
                'weight': 20,
                'maxconn': 30
            }
        }

3、删除
    输入:
        arg = {
            'bakend': 'www.oldboy.org',
            'record':{
                'server': '100.1.7.9',
                'weight': 20,
                'maxconn': 30
            }
        }
需求
global       
        log 127.0.0.1 local2
        daemon
        maxconn 256
        log 127.0.0.1 local2 info
defaults
        log global
        mode http
        timeout connect 5000ms
        timeout client 50000ms
        timeout server 50000ms
        option  dontlognull

listen stats :8888
        stats enable
        stats uri       /admin
        stats auth      admin:1234

frontend oldboy.org
        bind 0.0.0.0:80
        option httplog
        option httpclose
        option  forwardfor
        log global
        acl www hdr_reg(host) -i www.oldboy.org
        use_backend www.oldboy.org if www

backend www.oldboy.org
        server 100.1.7.9 100.1.7.9 weight 20 maxconn 3000
原配置文件

 

6. 字符编码与转码

详细文章:

http://www.cnblogs.com/yuanchenqi/articles/5956943.html

http://www.diveintopython3.net/strings.html

需知:

1.在python2默认编码是ASCII, python3里默认是unicode

2.unicode 分为 utf-32(占4个字节),utf-16(占两个字节),utf-8(占1-4个字节), so utf-16就是现在最常用的unicode版本, 不过在文件里存的还是utf-8,因为utf8省空间

3.在py3中encode,在转码的同时还会把string 变成bytes类型,decode在解码的同时还会把bytes变回string

 

 上图仅适用于py2

 

#-*-coding:utf-8-*-
__author__ = 'Alex Li'

import sys
print(sys.getdefaultencoding())


msg = "我爱北京天安门"
msg_gb2312 = msg.decode("utf-8").encode("gb2312")
gb2312_to_gbk = msg_gb2312.decode("gbk").encode("gbk")

print(msg)
print(msg_gb2312)
print(gb2312_to_gbk)
in python2
#-*-coding:gb2312 -*-   #这个也可以去掉
__author__ = 'Alex Li'

import sys
print(sys.getdefaultencoding())


msg = "我爱北京天安门"
#msg_gb2312 = msg.decode("utf-8").encode("gb2312")
msg_gb2312 = msg.encode("gb2312") #默认就是unicode,不用再decode,喜大普奔
gb2312_to_unicode = msg_gb2312.decode("gb2312")
gb2312_to_utf8 = msg_gb2312.decode("gb2312").encode("utf-8")

print(msg)
print(msg_gb2312)
print(gb2312_to_unicode)
print(gb2312_to_utf8)
in python3

 

 

7.  内置函数

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来源: https://www.cnblogs.com/fke2018/p/14356641.html