[New-bugs-announce] [issue25009] queue.Queue() does not validate the maxsize argument

[Alex Willmer]

New submission from Alex Willmer:

The maxsize argument when initializing a Queue is expected to be an int (technically anything that can be compared to an int). However the class takes any value. In Python 3 this throws "TypeError: unorderable types" once e.g. .put() is called.

On the basis that errors should not pass silent, should maxsize be checked for compatibility at initialization time? e.g.

Desired:

>>> import queue
>>> q = queue.Queue(range(10))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.5/queue.py", line nnn, in __init__()
    ...
TypeError: 'range' object cannot be interpreted as an integer


Actual:

Python 3.5.0rc2 (default, Aug 25 2015, 20:29:07) 
[GCC 5.2.1 20150825] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import queue
>>> q = queue.Queue(range(10)) # Silently accepts an invalid maxsize
>>> q.put('foo')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.5/queue.py", line 127, in put
    if self.maxsize > 0:
TypeError: unorderable types: range() > int()

----------
components: Library (Lib)
messages: 249914
nosy: Alex.Willmer
priority: normal
severity: normal
status: open
title: queue.Queue() does not validate the maxsize argument
type: behavior
versions: Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25009>
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