Pyomo
Python 3.11.8 on Windows: tuple object does not support item assignment
Summary
I ran a very simple Python script (see below) that imports pyomo.environ. When executing the script I received the following error: TypeError: 'tuple' object does not support item assignment
Steps to reproduce the issue
The Python script to reproduce the error:
import pyomo.environ
def do_nothing():
pass
if __name__ == '__main__':
do_nothing()
Error Message
Traceback (most recent call last):
File "C:\devwork\forecasting_fas1\src_py\test\unit\calculator\fas\debt_optimizer\tuple_error.py", line 1, in <module>
import pyomo.environ
File "C:\devwork\forecasting_fas1\src_py\cenv\Lib\site-packages\pyomo\environ\__init__.py", line 103, in <module>
_import_packages()
File "C:\devwork\forecasting_fas1\src_py\cenv\Lib\site-packages\pyomo\environ\__init__.py", line 74, in _import_packages
_do_import(pname)
File "C:\devwork\forecasting_fas1\src_py\cenv\Lib\site-packages\pyomo\environ\__init__.py", line 18, in _do_import
importlib.import_module(pkg_name)
File "C:\devwork\forecasting_fas1\src_py\cenv\Lib\importlib\__init__.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\devwork\forecasting_fas1\src_py\cenv\Lib\site-packages\pyomo\core\__init__.py", line 36, in <module>
import pyomo.core.base._pyomo
File "C:\devwork\forecasting_fas1\src_py\cenv\Lib\site-packages\pyomo\core\base\__init__.py", line 20, in <module>
import pyomo.core.base.boolean_var
File "C:\devwork\forecasting_fas1\src_py\cenv\Lib\site-packages\pyomo\core\base\boolean_var.py", line 15, in <module>
from pyomo.core.base.set import Set, BooleanSet
File "C:\devwork\forecasting_fas1\src_py\cenv\Lib\site-packages\pyomo\core\base\set.py", line 4055, in <module>
DeclareGlobalSet(_AnySet(
File "C:\devwork\forecasting_fas1\src_py\cenv\Lib\site-packages\pyomo\core\base\set.py", line 4049, in DeclareGlobalSet
_set.__class__.__setstate__(_set, obj.__getstate__())
^^^^^^^^^^^^^^^^^^
File "C:\devwork\forecasting_fas1\src_py\cenv\Lib\site-packages\pyomo\core\base\component.py", line 734, in __getstate__
state = _base.__getstate__()
^^^^^^^^^^^^^^^^^^^^
File "C:\devwork\forecasting_fas1\src_py\cenv\Lib\site-packages\pyomo\core\base\indexed_component.py", line 227, in __getstate__
state = super(IndexedComponent, self).__getstate__()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\devwork\forecasting_fas1\src_py\cenv\Lib\site-packages\pyomo\core\base\component.py", line 438, in __getstate__
state[key] = val
~~~~~^^^^^
TypeError: 'tuple' object does not support item assignment
Information on your system
Pyomo version: 6.7.3 Python version: 3.11.8 Operating system: Windows 10 Enterprise with OS build=19045.4529 How Pyomo was installed: PyPy Solver (if applicable): N/A
Additional information
An exception occurs in the file core.base.component.py. Here is the function __getstate__ with docstring and comments dropped:
def __getstate__(self):
_base = super(Component,self)
if hasattr(_base, '__getstate__'):
state = _base.__getstate__()
for key,val in iteritems(self.__dict__):
if key not in state:
state[key] = val # >>>> TypeError occurs here: 'tuple' object does not support item assignment <<<<
else:
state = dict(self.__dict__)
if self._parent is not None:
state['_parent'] = self._parent()
return state
Consider the code snippet from __getstate__:
state = _base.__getstate__()
for key,val in iteritems(self.__dict__):
if key not in state:
state[key] = val
the variable state is a tuple with 2 elements. The variable self.__dict__ is a dictionary with 16 items. When the line:
for key, val in iteritems(self.__dict__):
is executed and the key is 'init_domain' the statement if key not in state is true by construction.
The key 'init_domain' will never be in the tuple state, but will be in state[0], which is a dictionary.
Somewhat expectedly, I cannot reproduce this. I will keep trying to do so, but my suspicion is that there may be something in your environment that is to blame. Can you try to create a virtual environment and see what happens?
This is how I do so on a Mac:
python -m venv virtual-python
source virtual-python/bin/activate
pip install pyomo
# Run your script
Here are some instructions that include Windows: https://www.geeksforgeeks.org/creating-python-virtual-environment-windows-linux/
I will look at it again.
On Wed, Jul 17, 2024, 11:47 Miranda Mundt @.***> wrote:
Somewhat expectedly, I cannot reproduce this. I will keep trying to do so, but my suspicion is that there may be something in your environment that is to blame. Can you try to create a virtual environment and see what happens?
This is how I do so on a Mac:
python -m venv virtual-python source virtual-python/bin/activate pip install pyomo
Run your script
Here are some instructions that include Windows: https://www.geeksforgeeks.org/creating-python-virtual-environment-windows-linux/
— Reply to this email directly, view it on GitHub https://github.com/Pyomo/pyomo/issues/3320#issuecomment-2233636937, or unsubscribe https://github.com/notifications/unsubscribe-auth/ACBR5L3VMZNV3TPCSGFWBD3ZM2GXTAVCNFSM6AAAAABK43KJV2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDEMZTGYZTMOJTG4 . You are receiving this because you authored the thread.Message ID: @.***>
(Looking back through older issues). I am very confused by this. I am not actually sure what version of Pyomo you are running. The Component.__getstate__ definition was removed in 6.4.3 (when we moved the component hierarchy onto the AutoSlots infrastructure). Further, looking back at releases, I couldn't find one where state[key] = val was actually on line 438.
My guess is that you might have a corrupted Python environment where you somehow have a mix of two Pyomo builds are available in the environment?
As we are unable to reproduce the bug, and haven't gotten additional response from the original poster in 4 months, I'll close this issue. If you are still experiencing problems, please feel free to comment here or open a new issue.
