Uwe Krien

I cannot test qt4 but I forked this repository in order to adapt it to qt5 without backward compatibility with qt4. https://github.com/uvchik/easygui_qt5

What do mean with the `latest version`? For me `get_file_names()` dids not work with pyqt5. I had to change it according to the following page: http://pyqt.sourceforge.net/Docs/PyQt5/pyqt4_differences.html#qfiledialog ```diff - files =...

I could make a PR but I am not sure if my changes work on pyqt4.

@simnh Is this ready to merge? @c-koehl Do you have a good example. I think it is a good idea to publish an example on oemof-examples to make this feature...

I fixed the conflicts caused by the restructuring of oemof. Please check if everything still works as expected. @simnh: This PR is related to this example: https://github.com/oemof/oemof-examples/pull/53

I tried to understand this part: ```python if ( len(self.schedule) != 0 and ((len(self.schedule_cost_pos) == 0 and not self.schedule_cost_pos[0]) or (len(self.schedule_cost_neg) == 0 and not self.schedule_cost_neg[0]))): raise ValueError("The penalty and...

I agree with @jokochems regarding the nested structure. I would add two attributes, one for the Investment object and one for the NonConvex object. Than it is easy to decide...

I really like the idea of integrating piecewise linearisation :smile: I just wonder if it is possible to create a more generic component from your idea. I could think of...

@gnn Could you check this?

I cannot see the changes made by this PR due to hundreds of changed lines that do not belong to this PR. However, I like ```custom_kwargs``` as it is a...