以下代码均采用Python 3.5.2编写。新建一个名为HelloWorld.py的文件，当然名字无所谓，输入以下代码：
#filter def larger100(a): return a>100 for i in filter(larger100,[10,56,101,500]): print(i) #reduce from functools import reduce data_list = [1,2,5,7,9] result=reduce(lambda x,y: x+y, data_list) print(result) #Generator Expression def gen(): for i in range(4): yield i for i in gen(): print(i) gen = (x for x in range(4)) for i in gen: print(i) #List Comprehension l=[] for i in range(5): l.append(i**2) print(l) l=[x**2 for x in range(5)] print(l) x1=[1,3,5] y1=[9,12,13] l=[x**2 for (x,y) in zip(x1,y1) if y>10] print(l) #Lazy Evaluation a=range(10) result=map(lambda x:x**2, a) for i in result: print(i) #itertools from itertools import * #count(5,2) 5,7,9,11,13,... #cycle("abc") a b c a b c a b ... #repeat(1.2) 1.2 1.2 1.2 ... for i in repeat(10,5): print(i) for i in chain([1,2,3],[4,5,7]): print(i) def height_class(h): if h>180: return "tall" elif h<160: return "short" else: return "middle" friends = [191, 158, 159, 165, 170, 177, 181, 182, 190] friends=sorted(friends, key=height_class) print(friends) for m,n in groupby(friends, key=height_class): print(m) print(list(n))方便起见，可将未读到的代码注释掉，一段段阅读运行，查看结果，理解原理。
