python Memo，,list&tuple

python Memo，,list&tuple

list&tuple 运算

乘以constant

>>> x = ((1,2),)>>> x*2((1, 2), (1, 2))>>> x = ((1,2))>>> x*2(1, 2, 1, 2)>>> 

从上面可以看出，tuple或者list和一个常数相乘，会复制元素得到一个新的tuple或list,需要注意的是有无逗号，这将决定是复制元素还是 "子tuple"。

tuple或list相加

>>> a = [1,2,3,4,5]>>> a + [6][1, 2, 3, 4, 5, 6]>>> a = (1,2,3,4,5)>>> a +(6)Traceback (most recent call last):  File "<pyshell#189>", line 1, in <module>    a +(6)TypeError: can only concatenate tuple (not "int") to tuple>>> a + (6,)(1, 2, 3, 4, 5, 6)>>> type((6))<type ‘int‘>>>> type([6])<type ‘list‘>>>> 

　　tuple和list在此处略有区别

python Memo