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.
Thanks,
Hassan