New submission from Leon Matthews <l...@lost.co.nz>:
According the docs for the tempfile module, SpooledTemporaryFile()
should operate "exactly as TemporaryFile() does". However, while
playing around trying to learn the module I found a couple of places
where this is not the case:
import tempfile
hello = bytes('Hello World!', encoding='utf-8')
tf = tempfile.TemporaryFile()
stf = tempfile.SpooledTemporaryFile()
tf.write(hello)
stf.write(hello)
# (1) Read after write behaviour differs...
>>> print(tf.read())
b'Hello World'
>>> print(stf.read())
b''
# ...unless you seek first
>>> tf.seek(0)
>>> stf.seek(0)
>>> print(tf.read())
b'Hello World'
>>> print(stf.read())
b'Hello World'
# (2) Name attribute is fragile...
>>> print(tf.name)
3
print(stf.name)
AttributeError: '_io.BytesIO' object has no attribute 'name'
# ...until StringIO object replaced
stf.rollover()
print(stf.name) # 4
I'm not sure if this should be categorised as a documentation or code
issue. In either case please be gentle -- I'm still just learning Python
(evaluating it as a [now likely] replacement for PHP for web application
development in our company). I'm filing this bug because, as a
beginner, I was confused by the inconsistency between the docs and the
actual behaviour.
I'd be happy to try and write documentation and/or unit tests about
this, if somebody would be willing to review them for me... :-)
----------
components: Library (Lib)
messages: 90789
nosy: leonov
severity: normal
status: open
title: SpooledTemporaryFile operates differently to TemporaryFile
type: behavior
versions: Python 3.1
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue6541>
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