優點：

1：可以簡單使用一個腳本來替代我們的函數

2：不用考慮命名的問題

3：簡化代碼的可讀性，不用跳轉到def了，省去這樣的步驟

內置函數：bif

filter：過濾器

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 string11     12     Return those items of sequence for which function(item) is true.  If13     function is None, return the items that are true.  If sequence is a tuple14     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 >>> tmp22 [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]23 >>> def fun(x):24     return x%225 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 >>>

遞歸

python限制的遞歸深度大概幾百層，但是可以手動設置

》》》import sys

>>> sys.setrecursionlimit(10000)

python---------------------------------------eg‘1------------------

python 內置&&遞歸