mkxtemp - a temporary file context manager for use by external processes that need temp files

mkxtemp.py

#!/usr/bin/env python
# Mkxtemp - a temporary file context manager for use by external processes
# Placed in the Public Domain by Santtu Pajukanta <santtu@pajukanta.fi> 2012

from contextlib import contextmanager
from tempfile import NamedTemporaryFile

import os
import unittest

@contextmanager
def mkxtemp():
    with NamedTemporaryFile(delete=False) as f:
        name = f.name

    try:
        yield name
    finally:
        os.unlink(name)

class MkxtempTest(unittest.TestCase):
    def test_mkxtemp(self):
        with mkxtemp() as path:
            # Has a non-empty filename.
            self.assertTrue(len(path))

            # The file exists.
            self.assertTrue(os.path.exists(path))

            # The file can be written.
            with open(path, "wb") as f:
                f.write("foo")

            # The file can be read and reading it returns what was written.
            with open(path, "rb") as f:
                self.assertEquals(f.read(), "foo")

            # The file still exists and can be accessed.
            self.assertTrue(os.stat(path))

        # The file no longer exists.
        self.assertFalse(os.path.exists(path))

if __name__ == "__main__":
    unittest.main()