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']