高阶函数：map，reduce

 1 #-*-coding:utf-8-*-
 2 #首字母大写，其他小写
 3 def toCapitalize(s):
 4     return s.capitalize()
 5 
 6 S = [‘adam‘,‘LISA‘,‘barT‘]
 7 print map(toCapitalize,S)
 8 
 9 #对一个List求积
10 def prod(li):
11     # def multi(a,b):
12     #     return a*b
13     # return reduce(multi,li)
14     return reduce(lambda x,y:x*y,li)
15 Li = [3,4,5]
16 print prod(Li)
17 
18 #str2int的实现
19 def str2int(s):
20     def char2num(chr):
21         return {‘0‘: 0, ‘1‘: 1, ‘2‘: 2, ‘3‘: 3, ‘4‘: 4, ‘5‘: 5, ‘6‘: 6, ‘7‘: 7, ‘8‘: 8, ‘9‘: 9}[chr]
22     return reduce(lambda x,y : x*10+y ,map(char2num,s))
23 St= ‘17362‘
24 print str2int(St)

[‘Adam‘, ‘Lisa‘, ‘Bart‘]
60
17362