Python中的zip（）-yiteyi-C++库

Python zip（）方法 获取iterable或containers并返回一个迭代器对象，该对象具有来自所有容器的映射值。

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习惯了映射多个容器的相似索引，以便仅使用单个实体即可使用它们。

语法： zip（*迭代器）

参数： Python可重用文件或容器（列表、字符串等） 返回值： 返回一个迭代器对象，该对象具有来自所有容器。

Python zip（）示例

示例1:Python压缩两个列表

Python3

                         name                                     =                                     [                                     "Manjeet"                                     ,                                     "Nikhil"                                     ,                                     "Shambhavi"                                     ,                                     "Astha"                                     ]                       
                         roll_no                                     =                                     [                                     4                                     ,                                     1                                     ,                                     3                                     ,                                     2                                     ]                       
           
                         # using zip() to map values                       
                         mapped                                     =                                     zip                                     (name, roll_no)                       
           
                         print                                     (                                     set                                     (mapped))                       

输出：

{('Shambhavi', 3), ('Nikhil', 1), ('Astha', 2), ('Manjeet', 4)}

示例2：Python zip 列举

Python3

                         names                                     =                                     [                                     'Mukesh'                                     ,                                     'Roni'                                     ,                                     'Chari'                                     ]                       
                         ages                                     =                                     [                                     24                                     ,                                     50                                     ,                                     18                                     ]                       
           
                         for                                     i, (name, age)                                     in                                     enumerate                                     (                                     zip                                     (names, ages)):                       
                                                 print                                     (i, name, age)                       

输出：

0 Mukesh 241 Roni 502 Chari 18

示例3：Python zip（）字典

Python3

                         stocks                                     =                                     [                                     'reliance'                                     ,                                     'infosys'                                     ,                                     'tcs'                                     ]                       
                         prices                                     =                                     [                                     2175                                     ,                                     1127                                     ,                                     2750                                     ]                       
           
                         new_dict                                     =                                     {stocks: prices                                     for                                     stocks,                       
                                                 prices                                     in                                     zip                                     (stocks, prices)}                       
                         print                                     (new_dict)                       

输出：

{'reliance': 2175, 'infosys': 1127, 'tcs': 2750}

如何解压？

解压意味着将压缩后的值转换回原来的个人。这是在“帮助”的帮助下完成的 * “接线员。

Python3

                         # Python code to demonstrate the working of                       
                         # unzip                       
           
                         # initializing lists                       
                         name                                     =                                     [                                     "Manjeet"                                     ,                                     "Nikhil"                                     ,                                     "Shambhavi"                                     ,                                     "Astha"                                     ]                       
                         roll_no                                     =                                     [                                     4                                     ,                                     1                                     ,                                     3                                     ,                                     2                                     ]                       
                         marks                                     =                                     [                                     40                                     ,                                     50                                     ,                                     60                                     ,                                     70                                     ]                       
           
                         # using zip() to map values                       
                         mapped                                     =                                     zip                                     (name, roll_no, marks)                       
           
                         # converting values to print as list                       
                         mapped                                     =                                     list                                     (mapped)                       
           
                         # printing resultant values                       
                         print                                     (                                     "The zipped result is : "                                     , end                                     =                                     "")                       
                         print                                     (mapped)                       
           
                         print                                     (                                     ""                                     )                       
           
                         # unzipping values                       
                         namz, roll_noz, marksz                                     =                                     zip                                     (                                     *                                     mapped)                       
           
                         print                                     (                                     "The unzipped result: "                                     , end                                     =                                     "")                       
           
                         # printing initial lists                       
                         print                                     (                                     "The name list is : "                                     , end                                     =                                     "")                       
                         print                                     (namz)                       
           
                         print                                     (                                     "The roll_no list is : "                                     , end                                     =                                     "")                       
                         print                                     (roll_noz)                       
           
                         print                                     (                                     "The marks list is : "                                     , end                                     =                                     "")                       
                         print                                     (marksz)                       

输出：

The zipped result is : [('Manjeet', 4, 40), ('Nikhil', 1, 50), ('Shambhavi', 3, 60), ('Astha', 2, 70)]The unzipped result: The name list is : ('Manjeet', 'Nikhil', 'Shambhavi', 'Astha')The roll_no list is : (4, 1, 3, 2)The marks list is : (40, 50, 60, 70)

实际应用

有许多可能的应用程序可以说是使用zip执行的 学生数据库或记分卡 或任何其他需要组映射的实用程序。下面是记分卡的一个小例子。

Python3

                         # Python code to demonstrate the application of                       
                         # zip()                       
           
                         # initializing list of players.                       
                         players                                     =                                     [                                     "Sachin"                                     ,                                     "Sehwag"                                     ,                                     "Gambhir"                                     ,                                     "Dravid"                                     ,                                     "Raina"                                     ]                       
           
                         # initializing their scores                       
                         scores                                     =                                     [                                     100                                     ,                                     15                                     ,                                     17                                     ,                                     28                                     ,                                     43                                     ]                       
           
                         # printing players and scores.                       
                         for                                     pl, sc                                     in                                     zip                                     (players, scores):                       
                                                 print                                     (                                     "Player :  %s     Score : %d"                                     %                                     (pl, sc))                       

输出：

Player :  Sachin     Score : 100Player :  Sehwag     Score : 15Player :  Gambhir     Score : 17Player :  Dravid     Score : 28Player :  Raina     Score : 43

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