标签：pen 处理 none highlight ack obj else ESS asc
map()函数：处理序列中的每一个元素，得到的结果是一个迭代器形式，该迭代器的位置以及元素个数与原来一样。可以处理任何可迭代序列
filter()函数：遍历序列中的每一个元素，判断每个元素得到的布尔值，如果是True则留下来
1 people=[{‘name‘:‘alex‘,‘age‘:1000, 2 ‘name‘:‘alex2‘,‘age‘: 10000, 3 ‘name‘:‘alex3‘,‘age‘: 9000, 4 ‘name‘:‘alex4‘,‘age‘: 35, 5 ‘name‘:‘alex5‘,‘age‘: 18,}] 6 res=(list(filter(lambda x:x[‘age‘]<=100,people))) 7 print(res)
[{‘name‘: ‘alex5‘, ‘age‘: 18}]
Process finished with exit code 0
1 movie_perple = [‘chenchensb_‘,‘linlin‘,‘guoguo0‘,‘wowowsb_‘,‘dascsasb_‘] 2 # lambda x:x.endswith(‘sb_‘) 3 def filte(func,x): 4 array=[] 5 for i in x: 6 if not func(i): 7 array.append(i) 8 return array 9 # res1=filter_test(lambda x:x.endswith(‘sb_‘),movie_perple) 10 # res2=filter_test(lambda x:x.startswith(‘c‘),movie_perple) 11 print(filter(lambda x:x.endswith(‘sb_‘),movie_perple)) 12 print(list(filter(lambda x:x.endswith(‘sb_‘),movie_perple))) 13 print(list(filter(lambda x:not x.endswith(‘sb_‘),movie_perple))) 14 # print(res1) 15 # print(res2)
运行结果：
1 <filter object at 0x02D8FCD0> 2 [‘chenchensb_‘, ‘wowowsb_‘, ‘dascsasb_‘] 3 [‘linlin‘, ‘guoguo0‘] 4 5 Process finished with exit code 0
reduce()函数：处理一个序列，然后把序列进行合并
1 from functools import reduce 2 num_l=[1,2,3,4,5] 3 # reduce(函数,可迭代对象，初始值) 4 print(reduce(lambda x,y:x+y,num_l,100))
1 list=[1,2,3,5,6] 2 def reduce_num(func,array,init=None): 3 if init is None: 4 res=list.pop(0) 5 else: 6 res=init 7 for num in array: 8 res=func(res,num) 9 return res 10 result=reduce_num(lambda x,y:x*y,list,100) 11 print(result)
运行结果：
18000
Process finished with exit code 0
标签：pen 处理 none highlight ack obj else ESS asc
原文地址：https://www.cnblogs.com/gl-gl/p/9130124.html
