#map list输出>>> map(str,[1,2,3,4])['1', '2', '3', '4']

 

#函数fndef 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