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Mon Dec 28 05:07:04 CET 2009 · https://mail.python.org/pipermail/python-dev/2009-December/094669.html

>> No application developer will quickly figure out what a tilde means.
>> Maybe
>> it means 'roughly', but it requires too much thought and is ambiguous.
>> 2.5
>> is not roughly 2.5.2. It is the same exactly.
>>
>> Before we had : Requires-Python: 2.5, 2.6
>>
>> That made much more sense. It was simple and unambiguous, and is
>> relevant
>> to typical packaging scenarios.
>
> Unfortunately, it is fairly ambiguous, and makes no sense. It means
> "requires Python 2.5 *AND* requires Python 2.6", which is a requirement
> that no single version can meet.

No, it means a library requires either python 2.5 *OR* python 2.6 to be
installed properly.

If not, the implication is that the user will be prompted to install anyway.

David

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Showing content from https://mail.python.org/pipermail/python-dev/2009-December/094669.html below:

[Python-Dev] Proposing PEP 345 : Metadata for Python Software Packages 1.2