Looking for suitable data clustering

Dear Sir/Miss,
I am using python language and like to apply deep learning algorithm on medical data. However, I am new to python and don’t know which algorithm would be suitable to apply for data clustering. I am looking for algorithm that does not need input parameters and cluster the data. I would be so thankful if anyone could guide me and mention me any suitable algorithm that would be good for such type clustering. Looking forward to hearing from you soon.