[PyQt] Cannot install PyQt 5 on Ubuntu 14.04 (Python 3.4)

[Phil Thompson]

On 11 Jan 2017, at 12:10 pm, Ghislain Vaillant <ghisvail at gmail.com> wrote:
> 
> On Wed, 2017-01-11 at 10:04 +0000, Phil Thompson wrote:
>> On 10 Jan 2017, at 10:52 pm, Ghislain Vaillant <ghisvail at gmail.com> wrote:
>>> 
>>> On Tue, 2017-01-10 at 22:08 +0000, Phil Thompson wrote:
>>>> On 10 Jan 2017, at 6:45 pm, Ghislain Vaillant <ghisvail at gmail.com> wrote:
>>>>> 
>>>>> Although there are wheels available for Python 3.4 now, it is still not possible to install PyQt 5 in a venv created on Ubuntu 14.04.
>>>>> 
>>>>> I get the following error:
>>>>> 
>>>>> ```
>>>>> pip install pyqt5
>>>>> Collecting pyqt5
>>>>> Using cached PyQt5-5.7.1-5.7.1-cp34.cp35.cp36-abi3-manylinux1_x86_64.whl
>>>>> Collecting sip>=4.19 (from pyqt5)
>>>>> Could not find a version that satisfies the requirement sip>=4.19 (from pyqt5) (from versions: )
>>>>> No matching distribution found for sip>=4.19 (from pyqt5)
>>>>> ```
>>>>> 
>>>>> Checking on PyPI, there are only wheels for sip==4.19 for Python 3.5+ and no tarball at all, hence the failure.
>>>> 
>>>> There are no SIP wheels for Python v3.4 because it's less confusing to support the same versions across all platforms.
>>>> 
>>>> Phil
>>> 
>>> So, how am I supposed to install the PyQt5 wheel on Python 3.4 then?
>> 
>> You could build and install SIP your self and then pip install PyQt5 with --no-deps.
> 
> But that kind of defeat the purpose of having a Python 3.4 compatible
> wheel of PyQt5 hosted on PyPI if one still has to manually compile its
> requirements.

The fact that the PyQt5 wheels work with Python v3.4 is a coincidence.

>>> Besides, I did not understand your justification for the lack of sip
>>> wheel for Python 3.4.
>> 
>> https://www.riverbankcomputing.com/pipermail/pyqt/2016-December/038476.html
> 
> The discussion you linked sounds specific to Windows. I am confused,
> since my issue is related to Linux (Ubuntu 14.04 specifically).

As I said before it is less confusing (and less work for me) to have consistency across platforms.

As it says in...

https://www.riverbankcomputing.com/software/pyqt/download5

...wheels are provided for Python v3.5 and later. The naming of the wheels is as recommended by the Distutils SIG. It is probably counter-intuitive because the relevant PEP (425) doesn't properly address the limited API (and its different versions).

Phil