[PyQt] Recreating virtualenvs with PyQt

[Phil Thompson]

On 13 Mar 2017, at 6:39 am, Florian Bruhin <me at the-compiler.org> wrote:
> 
> Hi,
> 
> The usual way to recreate a virtualenv is to freeze its dependencies
> and install them in a new env:
> 
>    venv1/bin/pip freeze > requirements.txt
>    venv2/bin/pip install -r requirements.txt
> 
> However, this doesn't seem to work with PyQt5 since the fixed up 5.7.1
> packages. "pip freeze" still shows 5.7.1, but that's not installable:

You mean the fixed up 5.8.1 packages?

> 	$ venv1/bin/pip install PyQt5
> 	Collecting PyQt5
> 	  Using cached PyQt5-5.8.1.1-5.8.0-cp35.cp36.cp37-abi3-manylinux1_x86_64.whl
> 	Collecting sip<4.20,>=4.19 (from PyQt5)
> 	  Using cached sip-4.19.1-cp36-cp36m-manylinux1_x86_64.whl
> 	Installing collected packages: sip, PyQt5
> 	Successfully installed PyQt5-5.8.1 sip-4.19.1
> 
> 	$ venv1/bin/pip freeze
> 	appdirs==1.4.3
> 	packaging==16.8
> 	pyparsing==2.2.0
> 	PyQt5==5.8.1
> 	sip==4.19.1
> 	six==1.10.0
> 
> 	$ venv1/bin/pip freeze > requirements.txt
> 	$ venv2/bin/pip install -r requirements.txt
> 	Requirement already satisfied: appdirs==1.4.3 in ./venv2/lib/python3.6/site-packages (from -r requirements.txt (line 1))
> 	Requirement already satisfied: packaging==16.8 in ./venv2/lib/python3.6/site-packages (from -r requirements.txt (line 2))
> 	Requirement already satisfied: pyparsing==2.2.0 in ./venv2/lib/python3.6/site-packages (from -r requirements.txt (line 3))
> 	Collecting PyQt5==5.8.1 (from -r requirements.txt (line 4))
> 	  Could not find a version that satisfies the requirement PyQt5==5.8.1 (from -r requirements.txt (line 4)) (from versions: 5.7.1, 5.8, 5.8.1.1)
> 	No matching distribution found for PyQt5==5.8.1 (from -r requirements.txt (line 4))

It's probably because I cheated because I simply renamed the wheel file and didn't change the internal meta-data to quickly work around a problem with PyPI.

If you edit requirements.txt to say PyQt5==5.8.1.1 it will probably work.

Phil