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  • 匿名函数,map,filter

    1、lambda,map

     1 num_l=[1,2,3,4,5,6]
     2 string='fuhaoka'
     3 a=map(lambda x:x+1,num_l)
     4 print(list(a))
     5 b=map(lambda x:x.upper(),string)
     6 print(list(b))
     7 c=map(lambda x:x**0.5,num_l)
     8 print(list(c))
     9 
    10 
    11 
    12 >>>
    13 [2, 3, 4, 5, 6, 7]
    14 ['F', 'U', 'H', 'A', 'O', 'K', 'A']
    15 [1.0, 1.4142135623730951, 1.7320508075688772, 2.0, 2.23606797749979, 2.449489742783178]

    2、filter

     1 student=['wang1','wang2','zhang1','zhang2','wang3','wang4','ma1','ma2']
     2 
     3 # def wang_xing(arry):
     4 #     wang=[]
     5 #     for i in arry:
     6 #         if not i.startswith('wang'):#不是以'wang开头'
     7 #             wang.append(i)
     8 #     return wang
     9 # print(wang_xing(student))
    10 
    11 
    12 a=filter(lambda x:x.startswith('wang'),student)
    13 print(list(a))
    14 
    15 
    16 
    17 >>>
    18 ['wang1', 'wang2', 'wang3', 'wang4']

     3、filter 取反

     1 student=['wang1','wang2','zhang1','zhang2','wang3','wang4','ma1','ma2']
     2 a=list(filter(lambda x: not x.endswith("2"),student))    #取出最后不是2的元素
     3 print("不是以2结尾的元素为:",a)
     4 
     5 b=list(filter(lambda x: x.endswith("2"),student))    #取出最后是2的元素
     6 print("以2结尾的元素为:",b)
     7 
     8 
     9 >>>
    10 不是以2结尾的元素为: ['wang1', 'zhang1', 'wang3', 'wang4', 'ma1']
    11 以2结尾的元素为: ['wang2', 'zhang2', 'ma2']
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  • 原文地址:https://www.cnblogs.com/forhowcar/p/12242176.html
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