+1 to the explanation by Chad.
I also not too long ago realized the cool stuff you can do with slices, to
overwrite and insert another slice into a list
In [1]: aList = range(5)
In [2]: print aList
[0, 1, 2, 3, 4]
In [3]: aList[3:] = ['a','b','c'] # insert, overwrite, and extend
In [4]: print aList
[0, 1, 2, 'a', 'b', 'c']
In [5]: aList[-2:] = ['x','y','z'] # insert via a negative index, overwrite,
and extend
In [6]: print aList
[0, 1, 2, 'a', 'x', 'y', 'z']
# You can also just simply insert to a specific index
In [16]: aList[3:3] = ['foo','bar','biz']
In [17]: print aList
[0, 1, 2, 'foo', 'bar', 'biz', 3, 4] # surrounding content preserved
Pretty neat stuff for treating a list like a buffer, where you aren't inserting
anything bigger than the list, but just replacing sections of it. It is almost
like the bytearray, but bytearray acts like a string instead of a list:
b = bytearray('foo bar biz')
print b[4:7]
# bytearray(b'bar')
b[4:7] = 'REPLACE'
print b
# bytearray(b'foo REPLACE biz')
On Mar 2, 2013, at 6:56 AM, Jesse Capper wrote:
> On Friday, March 1, 2013 8:33:02 AM UTC-8, Panupat Chongstitwattana wrote:
>> for a in arrays:
>> and
>> for a in arrays[:]:
>> seem to do exactly the same thing. Is there any difference made by the [:] ?
>
> Use array[:] when you want a copy of the list. It has the same result as
> doing list(array).
>
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