[issue8397] BZ2File doesn't protect against mixed iterator and read usage

[Alex Stapleton]

New submission from Alex Stapleton <alex.stapleton at gmail.com>:

Normal files throw exceptions if you mix methods.

>>> f = open("words")
>>> for l in f:
...     break
... 
>>> f.tell()
8192L
>>> f.readline()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: Mixing iteration and read methods would lose data



BZ2Files silently do the wrong thing. (Output is a coincidence. Honest!)

>>> import bz2
>>> f = bz2.BZ2File("words.bz2")
>>> for l in f:
...     break
... 
>>> f.tell()
8192L
>>> f.readline()
'lose\n'


Expected behaviour is for it to throw a ValueError like normal file objects.

----------
components: None
messages: 103126
nosy: Alex.Stapleton
severity: normal
status: open
title: BZ2File doesn't protect against mixed iterator and read usage
versions: Python 2.5, Python 2.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8397>
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