Content-Type: text/x-zim-wiki
Wiki-Format: zim 0.4
Creation-Date: 2012-12-02T09:40:06+08:00

====== list ======
Created Sunday 02 December 2012

~ $ ipython2
Python 2.7.3 (default, Apr 24 2012, 00:06:13) 
Type "copyright", "credits" or "license" for more information.

In [1]: lst = ['sdfds', 'dsfsd', 1, 3, [123, 22, 33, 'dsfds']]

__In [2]: lst[0]=[1, 2, 3]    //为列表的某个成员赋值时，python不会对右边的值进行迭代。__

In [3]: lst
Out[3]: 1, 2, 3], 'dsfsd', 1, 3, [123, 22, 33, 'dsfds'

__In [8]: lst[0:0] = 'dffds'  //为列表的成员列表赋值时，python会对右边的值进行迭代。__

In [9]: lst
Out[9]: [__'d', 'f', 'f', 'd', 's',__ 'dffds', 2, 3, 'dsfsd', 1, 3, [123, 22, 33, 'dsfds']]  //可见，python对等式右边序列进行了迭代。

In [4]: lst[0:1] = [1, 2, 3]

In [5]: lst
Out[5]: [1, 2, 3, 'dsfsd', 1, 3, [123, 22, 33, 'dsfds']]  //同上

In [10]: 

__In [10]: lst[0:0] = ['dffds']   //将字符序列外加[和]就可以阻止迭代(因为这时字符串时列表的唯一成员)__

In [11]: lst
Out[11]: 
['dffds',
 'd',
 'f',
 'f',
 'd',
 's',
 'dffds',
 2,
 3,
 'dsfsd',
 1,
 3,
 [123, 22, 33, 'dsfds']]

In [12]: 

In [24]: lst
Out[24]: '123\nstr'

In [25]: lst = [1, 2, 3]

In [26]: lst = lst + [4, 5, 6]  //列表相+时，python会对第二个列表进行__迭代__。

In [27]: lst
Out[27]: [1, 2, 3, **4, 5, 6]**

__In [28]: lst = lst + 'fdf'  //只能list间相加__
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-28-0818686a3a7d> in <module>()
----> 1 lst = lst + 'fdf'

TypeError: **can only concatenate list** (not "str") to list

In [29]: lst = lst + list('fdf')

In [30]: lst
Out[30]: [1, 2, 3, 4, 5, 6, 'f', 'd', 'f']

In [31]: