Pyomo 6.4.2与Python 3.11是否存在已知兼容性问题？

问题描述 #

尝试使用Python 3.11导入Pyomo 6.4.2时失败，报错信息如下：

Python 3.11.0 (v3.11.0:deaf509e8f, Oct 24 2022, 14:43:23) [Clang 13.0.0 (clang-1300.0.29.30)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from pyomo.environ import *
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/pyomo/environ/__init__.py", line 79, in <module>
    _import_packages()
  File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/pyomo/environ/__init__.py", line 61, in _import_packages
    _do_import(pname)
  File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/pyomo/environ/__init__.py", line 16, in _do_import
    importlib.import_module(pkg_name)
  File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/pyomo/core/__init__.py", line 43, in <module>
    from pyomo.core import expr, util, kernel
  File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/pyomo/core/util.py", line 21, in <module>
    from pyomo.core.base.var import Var
  File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/pyomo/core/base/__init__.py", line 34, in <module>
    from pyomo.core.base.label import (CuidLabeler,
  File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/pyomo/core/base/label.py", line 19, in <module>
    from pyomo.core.base.componentuid import ComponentUID
  File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/pyomo/core/base/componentuid.py", line 25, in <module>
    from pyomo.core.base.reference import Reference
  File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/pyomo/core/base/reference.py", line 17, in <module>
    from pyomo.core.base.set import SetOf, OrderedSetOf, _SetDataBase
  File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/pyomo/core/base/set.py", line 4208, in <module>
    DeclareGlobalSet(_AnySet(
  File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/pyomo/core/base/set.py", line 4199, in DeclareGlobalSet
    _set.__class__.__setstate__(_set, obj.__getstate__())
                                      ^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/pyomo/core/base/component.py", line 787, in __getstate__
    state = _base.__getstate__()
            ^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/pyomo/core/base/indexed_component.py", line 316, in __getstate__
    state = super(IndexedComponent, self).__getstate__()
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages/pyomo/core/base/component.py", line 471, in __getstate__
    state[key] = val
    ~~~~~^^^^^
TypeError: 'tuple' object does not support item assignment
>>> 

Pyomo版本信息 #

~ % pip3 show pyomo
Name: Pyomo
Version: 6.4.2
Summary: Pyomo: Python Optimization Modeling Objects
Home-page: http://pyomo.org
Author: 
Author-email: 
License: BSD
Location: /Library/Frameworks/Python.framework/Versions/3.11/lib/python3.11/site-packages
Requires: ply
Required-by: 
~ % 

解答 #

这是Pyomo 6.4.2版本与Python 3.11的已知兼容性问题。Python 3.11对__getstate__方法的返回值处理有变更，而Pyomo 6.4.2的代码中，component.py里的__getstate__方法错误地将返回的元组当作字典进行赋值操作，导致触发TypeError。

解决方法：

• 升级Pyomo到6.5.0及以上版本：后续版本已经修复了该兼容性问题，执行pip install --upgrade pyomo即可更新。
• 降级Python版本：如果暂时无法升级Pyomo，可以切换到Python 3.10或更低版本来规避该问题。

内容的提问来源于stack exchange，提问作者AirSquid