The 'PyQt5' distribution was not found and is required by veusz

[yurivict]

veusz-3.3 fails:

$ veusz
Traceback (most recent call last):
  File "/usr/local/bin/veusz", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/local/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3251, in <module>
    @_call_aside
  File "/usr/local/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3235, in _call_aside
    f(*args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/pkg_resources/__init__.py", line 3264, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/local/lib/python3.7/site-packages/pkg_resources/__init__.py", line 583, in _build_master
    ws.require(__requires__)
  File "/usr/local/lib/python3.7/site-packages/pkg_resources/__init__.py", line 900, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/local/lib/python3.7/site-packages/pkg_resources/__init__.py", line 786, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'PyQt5' distribution was not found and is required by veusz

But regular examples involving PyQt5 work fine.

OS: FreeBSD 12.2

[jeremysanders]

I'm not sure how you installed veusz. It seems to be some problem with your PyQt5 installation. Maybe it's related to this report: pypa/setuptools#1445

[yurivict]

The problem seems to be in setuptools. I created a new report: pypa/setuptools#2474

[jeremysanders]

I've run into this problem with the PPA package on Ubuntu Linux (Bionic). Searching around led me to this bug:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=891618

It looks like they disabled PyQt5 from install_requires to fix the bug. I tried patching this in Veusz which seems to work. It doesn't need the patch for more recent Ubuntu versions.

Index: veusz-3.3.1/setup.py
===================================================================
--- veusz-3.3.1.orig/setup.py
+++ veusz-3.3.1/setup.py
@@ -37,7 +37,7 @@ try:
     from setuptools import setup, Extension
     from setuptools.command.install import install as orig_install
 
-    extraoptions['install_requires'] = ['numpy', 'PyQt5']
+    extraoptions['install_requires'] = ['numpy']
     extraoptions['extras_require'] = {
         "optional": ['astropy', 'pyemf', 'sampy', 'iminuit', 'h5py']
     }

Maybe this is due to a packaging problem for PyQt5 on FreeBSD? The PyQt5 metadata setuptools uses could be missing.

[yurivict]

Same as pypa/setuptools#2474