python 查詢文字檔案的層次

i/o系統有一系列的層次構建而成

下面是操作乙個文字檔案的例子來檢視這種層次

>>

> f =
open
('sample.txt'
,'w'
)>>
> f
'sample.txt' mode=
'w' encoding=
'utf-8'
>
>>
> f.
buffer
<_io.bufferedwriter name=
'sample.txt'
>
>>
> f.
buffer
.raw
<_io.fileio name=
'sample.txt' mode=
'wb'
>
>>
>

'''

'''>>
> f
'sample.txt' mode=
'w' encoding=
'utf-8'
>
>>
buffer
, encoding=
'latin-1'
)>>
> f
'sample.txt' encoding=
'latin-1'
>
>>
> f.write(
'hello'
)traceback (most recent call last)
:file ""
, line 1,in
valueerror: i/o operation on closed file
.>>
>

detach() 方法會斷開檔案的最頂層並返回第二層，之後最頂層就沒什麼用了

>>

> f =
open
('sample.txt'
,'w'
)>>
> f
'sample.txt' mode=
'w' encoding=
'utf-8'
>
>>
> b = f.detach(
)>>
> b
<_io.bufferedwriter name=
'sample.txt'
>
>>
> f.write(
'hello'
)traceback (most recent call last)
:file ""
, line 1,in
valueerror:underlying buffer has been detached

>>

'latin-1'
)>>
> f
'sample.txt' encoding=
'latin-1'
>
>>
>

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