#map list输出
>>> map(str,[1,2,3,4])
[‘1‘, ‘2‘, ‘3‘, ‘4‘]
#函数fn
def fn(x,y):
return x*10+y
#函数char2num
>>> def char2num(s):
return{‘0‘:88,‘1‘:77,‘2‘:66}[s]
#reduce fn函数map char2num
>>> reduce(fn,map(char2num,‘012‘))
9636
#过程：1.88,77,66 2.88*10+77=957 3.957*10+66=9636
原文：http://www.cnblogs.com/cutepython/p/5994883.html