Hi, i have a list of files, some of which end with .hdf and one of them end with hdf5. I want to filter the hdf5 file. Thereforei set extensions: hdf5 I try to filter as below: if (any(filename.endswith(x) for x in extensions)): The problem is that i let's all files though rather than just the hdf5 file. Is there anything i am doing wrong? thanks matt