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75 lines
1.8 KiB
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75 lines
1.8 KiB
Plaintext
Content-Type: text/x-zim-wiki
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Wiki-Format: zim 0.4
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Creation-Date: 2012-12-02T09:40:06+08:00
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====== list ======
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Created Sunday 02 December 2012
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~ $ ipython2
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Python 2.7.3 (default, Apr 24 2012, 00:06:13)
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Type "copyright", "credits" or "license" for more information.
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In [1]: lst = ['sdfds', 'dsfsd', 1, 3, [123, 22, 33, 'dsfds']]
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__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。__
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In [3]: lst
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Out[3]: 1, 2, 3], 'dsfsd', 1, 3, [123, 22, 33, 'dsfds'
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__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。__
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In [9]: lst
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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。
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In [4]: lst[0:1] = [1, 2, 3]
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In [5]: lst
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Out[5]: [1, 2, 3, 'dsfsd', 1, 3, [123, 22, 33, 'dsfds']] //同上
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In [10]:
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__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)__
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In [11]: lst
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Out[11]:
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['dffds',
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'd',
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'f',
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'f',
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'd',
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's',
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'dffds',
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2,
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3,
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'dsfsd',
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1,
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3,
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[123, 22, 33, 'dsfds']]
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In [12]:
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In [24]: lst
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Out[24]: '123\nstr'
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In [25]: lst = [1, 2, 3]
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In [26]: lst = lst + [4, 5, 6] //列表相+时，python会对第二个列表进行__迭代__。
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In [27]: lst
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Out[27]: [1, 2, 3, **4, 5, 6]**
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__In [28]: lst = lst + 'fdf' //只能list间相加__
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---------------------------------------------------------------------------
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TypeError Traceback (most recent call last)
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<ipython-input-28-0818686a3a7d> in <module>()
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----> 1 lst = lst + 'fdf'
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TypeError: **can only concatenate list** (not "str") to list
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In [29]: lst = lst + list('fdf')
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In [30]: lst
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Out[30]: [1, 2, 3, 4, 5, 6, 'f', 'd', 'f']
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In [31]:
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