Python示例中的Lambda和filter-yiteyi-C++库

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给出一个数字列表，找出所有可被13整除的数字。

Input : my_list = [12, 65, 54, 39, 102, 
                     339, 221, 50, 70]
Output : [65, 39, 221]

我们可以使用拉姆达函数，以查找列表中可被13整除的所有数字。在Python中，匿名函数意味着函数没有名字。

Python中的filter（）函数接受函数和列表作为参数。这提供了一种优雅的方法，可以过滤掉序列“sequence”中的所有元素，函数将为其返回True。

                     # Python Program to find numbers divisible                   
                     # by thirteen from a list using anonymous                   
                     # function                   
                             
                     # Take a list of numbers.                   
                     my_list                               =                               [                               12                               ,                               65                               ,                               54                               ,                               39                               ,                               102                               ,                               339                               ,                               221                               ,                               50                               ,                               70                               , ]                   
                             
                     # use anonymous function to filter and comparing                   
                     # if divisible or not                   
                     result                               =                               list                               (                               filter                               (                               lambda                               x: (x                               %                               13                               =                               =                               0                               ), my_list))                   
                             
                     # printing the result                   
                     print                               (result)                   

输出：

[65, 39, 221]

给定字符串列表，查找所有回文。

                     # Python Program to find palindromes in                   
                     # a list of strings.                   
                             
                     my_list                               =                               [                               "geeks"                               ,                               "geeg"                               ,                               "keek"                               ,                               "practice"                               ,                               "aa"                               ]                   
                             
                     # use anonymous function to filter palindromes.                   
                     # Please refer below article for details of reversed                   
                     #                       https://www.geeksforgeeks.org/reverse-string-python-5-different-ways/                              
                     result                               =                               list                               (                               filter                               (                               lambda                               x: (x                               =                               =                               "".join(                               reversed                               (x))), my_list))                   
                             
                     # printing the result                   
                     print                               (result)                   

输出：

['geeg', 'keek', 'aa']

给定字符串列表和字符串str，打印str的所有字谜

                     # Python Program to find all anagrams of str in                   
                     # a list of strings.                   
                     from                               collections                               import                               Counter                   
                             
                     my_list                               =                               [                               "geeks"                               ,                               "geeg"                               ,                               "keegs"                               ,                               "practice"                               ,                               "aa"                               ]                   
                     str                               =                               "eegsk"                   
                             
                     # use anonymous function to filter anagrams of x.                   
                     # Please refer below article for details of reversed                   
                     #                       https://www.geeksforgeeks.org/anagram-checking-python-collections-counter/                              
                     result                               =                               list                               (                               filter                               (                               lambda                               x: (Counter(                               str                               )                               =                               =                               Counter(x)), my_list))                   
                             
                     # printing the result                   
                     print                               (result)                   

输出：

['geeks', 'keegs']

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