Global maven repo is unsecure as it is public. What would you do if you do to secure it?

All about Python What are Python decorators and how would you use them? How would you setup many projects where each one uses different versions of Python and third party libraries? What is PEP8 and do you follow its guidelines when you're coding? How are arguments passed – by reference of by value? (easy, but not that easy, I'm not sure if I can answer this clearly) Do you know what list and dict comprehensions are? Can you give an example? Show me three different ways of fetching every third item in the list Do you know what is the difference between lists and tuples? Can you give me an example for their usage? Do you know the difference between range and xrange? Tell me a few differences between Python 2.x and 3.x?