help with using temporary files

[Gerard Flanagan]

Hello

I'm sure its basic but I'm confused about the error I get with the
following code. Any help on basic tempfile usage?


ActivePython 2.4.1 Build 247 (ActiveState Corp.) based on
Python 2.4.1 (#65, Jun 20 2005, 17:01:55) [MSC v.1310 32 bit (Intel)]
on win32
Type "help", "copyright" , "credits" or "license" for more information.[color=blue][color=green][color=darkred]
>>>
>>> from tempfile import NamedTemporaryF ile
>>>
>>> tmp = NamedTemporaryF ile()
>>> tmp.write("Hell o")
>>> tmp.close()
>>>
>>> print tmp.name[/color][/color][/color]
c:\docume~1\ger ard\locals~1\te mp\tmpxqn4yl[color=blue][color=green][color=darkred]
>>>
>>> f = open(tmp.name)[/color][/color][/color]
Traceback (most recent call last):
File "<stdin>", line 1, in ?
IOError: [Errno 2] No such file or directory:
'c:\\docume~1\\ gerard\\locals~ 1\\temp\\tmpxqn 4yl'


Thanks

Gerard

[Jeremy Jones]

Re: help with using temporary files

Gerard Flanagan wrote:
[color=blue]
>Hello
>
> I'm sure its basic but I'm confused about the error I get with the
>following code. Any help on basic tempfile usage?
>
>
>ActivePython 2.4.1 Build 247 (ActiveState Corp.) based on
>Python 2.4.1 (#65, Jun 20 2005, 17:01:55) [MSC v.1310 32 bit (Intel)]
>on win32
>Type "help", "copyright" , "credits" or "license" for more information.
>
>[color=green][color=darkred]
>>>>from tempfile import NamedTemporaryF ile
>>>>
>>>>tmp = NamedTemporaryF ile()
>>>>tmp.write(" Hello")
>>>>tmp.close ()
>>>>
>>>>print tmp.name
>>>>
>>>>[/color][/color]
>c:\docume~1\ge rard\locals~1\t emp\tmpxqn4yl
>
>[color=green][color=darkred]
>>>>f = open(tmp.name)
>>>>
>>>>[/color][/color]
>Traceback (most recent call last):
> File "<stdin>", line 1, in ?
>IOError: [Errno 2] No such file or directory:
>'c:\\docume~1\ \gerard\\locals ~1\\temp\\tmpxq n4yl'
>
>
>Thanks
>
>Gerard
>
>
>[/color]

It gets created:

In [24]: import tempfile
In [25]: t = tempfile.NamedT emporaryFile()
In [26]: t.name
Out[26]: '/tmp/tmp9bmhap'
In [27]: ls -l /tmp/tmp*
-rw------- 1 jmjones jmjones 0 Nov 22 11:15 /tmp/tmp9bmhap

In [28]: t.write("123")

In [29]: t.flush()

In [30]: ls -l /tmp/tmp*
-rw------- 1 jmjones jmjones 3 Nov 22 11:15 /tmp/tmp9bmhap

In [31]: t.close()

In [32]: ls -l /tmp/tmp*
ls: /tmp/tmp*: No such file or directory



From the docstring, it gets automatically deleted on close:

def NamedTemporaryF ile(mode='w+b', bufsize=-1, suffix="",
prefix=template , dir=None):
"""Create and return a temporary file.
Arguments:
'prefix', 'suffix', 'dir' -- as for mkstemp.
'mode' -- the mode argument to os.fdopen (default "w+b").
'bufsize' -- the buffer size argument to os.fdopen (default -1).
The file is created as mkstemp() would do it.

Returns an object with a file-like interface; the name of the file
is accessible as file.name. The file will be automatically deleted
when it is closed.
"""

HTH,

- jmj