py39-pygraphviz @1.5 builds DLL referencing non-existant symbol _PyIOBase_Type

[diekhans (Mark Diekhans)]

after installing with python 3.9

% python3.9 -c 'import pygraphviz'
python3.9 -c 'import pygraphviz'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pygraphviz/__init__.py", line 58, in <module>
    from .agraph import AGraph, Node, Edge, Attribute, ItemAttribute, DotError
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pygraphviz/agraph.py", line 22, in <module>
    from . import graphviz as gv
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pygraphviz/graphviz.py", line 28, in <module>
    _graphviz = swig_import_helper()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pygraphviz/graphviz.py", line 24, in swig_import_helper
    _mod = imp.load_module('_graphviz', fp, pathname, description)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/imp.py", line 242, in load_module
    return load_dynamic(name, filename, file)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/imp.py", line 342, in load_dynamic
    return _load(spec)
ImportError: dlopen(/opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pygraphviz/_graphviz.cpython-39-darwin.so, 2): Symbol not found: _PyIOBase_Type
  Referenced from: /opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pygraphviz/_graphviz.cpython-39-darwin.so
  Expected in: flat namespace
 in /opt/local/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/pygraphviz/_graphviz.cpython-39-darwin.so

[reneeotten (Renee Otten)]

In 6c4777d8218680168d490592d13455b1e6d036d9/macports-ports (master):

py-pygraphviz: update to 1.7

• update to 1.6 for py36 subport
• keep at 1.5 for py27/py35 subports
• attempt to fix test phase; not all test pass

Closes: #62286

[reneeotten (Renee Otten)]

the test-suite doesn't pass completely (but it doesn't for any of the versions...). At least the import issue should be gone now.