map实现数字向字符串的转变

 a = 10
 s = str(a)
 print(type(s))
 print('转化后:',s)
 a = [1,2,3,4,5,6,7,8,9]
 #将列表中每一个元素转化为字符串
 L = map(str,a)
 print(list(L))
 print(type(L))

 <class 'str'>
 转化后: 10
 ['1', '2', '3', '4', '5', '6', '7', '8', '9']
 <class 'map'>