**What is the type of your request?** On the C++ side we introduced a class PeptideIdentificationList to encapsulate the vector<PeptideIdentification> In pyOpenMS we previously used pep_ids = [], and then something like IdXMLFile(..., pep_ids) to load the data. With the new class such code needs to be updated to pep_ids = PeptideIdentificationList() **Include a description of your report** <!-- Report description --> **Provide a screenshot, the text or URL of the corresponding documentation page or section** <!-- Screenshot, passage or URL --> **State the documentation version the report is about** <!-- Documentation version --> **Do you have any suggestions for how we can improve the documentation?** <!-- Suggestions -->