[PyQt] Recreating virtualenvs with PyQt

[Florian Bruhin]

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:

	$ 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))

Florian

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