元組的 max min sum

1. 串列可以修改，元組不能變更，所以應用在串列的 method 或 function，只要不會變更元組內容的都可以使用。

   [dywang@deyu zzz]$ cat tuple4.py 
   #!/usr/bin/python3
   # coding: utf-8
   
   tuplex = ( 32, 12, -98 )
   print("len(tuplex) =", len(tuplex))
   print("max(tuplex) =", max(tuplex))
   print("min(tuplex) =", min(tuplex))
   print("sum(tuplex) =", sum(tuplex))
   tupley = ( '9', 65, 54, 21, '7' )
   print("len(tupley) =", len(tupley))
   print("max(tupley) =", max(tupley))
   print("min(tupley) =", min(tupley))
   print("sum(tupley) =", sum(tupley))
   

2. 執行結果：len, max, min sum 對所有元素都是整數的元組可用，但 max min sum 在有字元及整數的元組不可用。

   [dywang@deyu zzz]$ ./tuple4.py 
   len(tuplex) = 3
   max(tuplex) = 32
   min(tuplex) = -98
   sum(tuplex) = -54
   max(tupley) = 5
   Traceback (most recent call last):
     File "./tuple4.py", line 11, in <module>
       print("max(tupley) =", max(tupley))
   TypeError: '>' not supported between instances of 'int' and 'str'