Obtaining results from multi-period optimization fails in 0.6.1

[jengstud]

Describe the bug
After (successfully) running a multi-period optimization, obtaining results via

results = solph.processing.results(om)

fails. It yields

ValueError: Results extraction failed!

caused by

.venv/lib/python3.14/site-packages/pandas/core/internals/base.py:98, in DataManager._validate_set_axis(self, axis, new_labels)
     97 elif new_len != old_len:
---> 98     raise ValueError(
     99         f"Length mismatch: Expected axis has {old_len} elements, new "
    100         f"values have {new_len} elements"
    101     )

ValueError: Length mismatch: Expected axis has 17519 elements, new values have 17520 elements

To Reproduce
Steps to reproduce the behavior:

1. Obtain latest oemof-solph release, e.g. via pip
2. Try out the multi-period investment tutorial from the docs
3. Run
4. See exception

Expected behavior
Results dictionary should be returned.

Desktop (please complete the following information):

• OS: macos Sequioa
• Python 3.14

[p-snft]

Hi @jengstud, thanks for bringing this up. Please note that multi-period optimization is experimental and partly untested. I recommend using it in solph 0.5.7, as it was validated at that time.