lambda
优点：
1：可以简单使用一个脚本来替代我们的函数
2：不用考虑命名的问题
3：简化代码的可读性，不用跳转到def了，省去这样的步骤
内置函数：bif
filter：过滤器
map：映射
1 >>> lambda x: 2*x+1 2 <function <lambda> at 0x00000000026C6AC8> 3 >>> g=lambda x: 2*x+1 4 >>> g(3) 5 7 6 >>> help(filter) 7 Help on built-in function filter in module __builtin__: 8 9 filter(...) 10 filter(function or None, sequence) -> list, tuple, or string 11 12 Return those items of sequence for which function(item) is true. If 13 function is None, return the items that are true. If sequence is a tuple 14 or string, return the same type, else return a list. 15 16 >>> filter(None,[1,0,True,False]) 17 [1, True] 18 >>> 19 >>> 20 >>> tmp=range(10) 21 >>> tmp 22 [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] 23 >>> def fun(x): 24 return x%2 25 26 >>> filter(fun,tmp) 27 [1, 3, 5, 7, 9] 28 >>> list(filter(lambda x:x%2,range(10))) 29 [1, 3, 5, 7, 9] 30 >>> list(map(lambda x:x*2,range(10))) 31 [0, 2, 4, 6, 8, 10, 12, 14, 16, 18] 32 >>>
递归
python限制的递归深度大概几百层，但是可以手动设置
》》》import sys
>>> sys.setrecursionlimit(10000)
python---------------------------------------eg'1------------------
