Problem writing temporary file using TemporaryFile()

[crystal2005]

Hi all,

Basically, i'm trying to create temporary file using TemporaryFile() module.

TemporaryFile( [mode='w+b'[, bufsize=-1[, suffix[, prefix[, dir]]]]])

It's done perfectly to create an intended file. But, i encountered a problem to write some useful testing text into the temporary file. When i try to used os.open() it always appears "TypeError: coercing to Unicode: need string or buffer, instance found"

How do i handle this problem??

What am i supposed to use instead of os.open() ??

The following code appears to work properly, i used mktemp() module in which it has been deprecated,

		timestamp = str(time())
		prefix = 'test'
		suffix = timestamp
		directory = 'temp'   
		date = strftime("%a, %d %b %y", localtime())
		path = tempfile.mktemp(suffix,prefix, directory)
		fd = os.open( path, os.O_RDWR|os.O_CREAT|os.O_EXCL,0700 )
		f=os.fdopen(fd,'w+b')
		post = email.Message.Message()
		post["Title"] = "This is a testing title"
		post["Date"] = date
		post["Timestamp"] = timestamp
		print >>f, post
		f.seek(0)
		f.close()

Thanks for any advice and help

[jlm699]

Hmm, interesting. I've never seen anyone use >> for writing to file in Python. You have some very strange things in this script... however I cannot reproduce your error. I don't know where email.Message.M essage() is coming from; but that is past the point where you receive an error anyway.

When I want to open I file I simply do the following:
[code=python]
>>> filename = 'foo.bar'
>>> fh = open(filename, 'w')
>>> fh.write('This is some text\n')
>>> fh.close()
>>>
>>> fh = open(filename, 'r')
>>> fh.read()
'This is some text\n'
>>> [/code]

It seems odd that you are receiving errors about unicode. Have you done this interactively in the shell to see if perhaps one of your strings somewhere is accidentally a unicode?

[crystal2005]

Hmm, interesting. I've never seen anyone use >> for writing to file in Python. You have some very strange things in this script... however I cannot reproduce your error. I don't know where email.Message.M essage() is coming from; but that is past the point where you receive an error anyway.

When I want to open I file I simply do the following:
[code=python]
>>> filename = 'foo.bar'
>>> fh = open(filename, 'w')
>>> fh.write('This is some text\n')
>>> fh.close()
>>>
>>> fh = open(filename, 'r')
>>> fh.read()
'This is some text\n'
>>> [/code]

It seems odd that you are receiving errors about unicode. Have you done this interactively in the shell to see if perhaps one of your strings somewhere is accidentally a unicode?

The way i used >> to write file is probably just another way in python. My real problem happened when i tried to write file into a temporary file produced by TemporaryFile module.

What i have done as the following code

import tempfile, email, os
from time import time, localtime, strftime
from email.Message import Message

timestamp = str(time())
prefix = 'test'
suffix = timestamp
directory = 'temp'
date = strftime("%a, %d %b %y", localtime())
path = tempfile.TemporaryFile('w+b', -1, suffix, prefix, directory)

Till this step, so far as i expected. It produced a temporary file that would clean up itself after i closed interactive python shell.

Now, when i try the following code

fd = os.open( path, os.O_RDWR|os.O_CREAT|os.O_EXCL,0700 )

it always appears to have unicode error. It didn't appear any error then i used mktemp module.

I don't know why ....

any advice??

Thanks

[jlm699]

I see what you're saying now...

TemporaryFile doesn't simply return a filename like the mktemp function does, it actually returns the file handle to the file. If you would like to view the name of the file use: path.name

path can be used as a regular file handle at this point with the functions write(), seek(), flush(), etc.

HTH