The very good answer from @Andrew Clark gives the right direction, but unfortunately it answers the original question only partly ;-)

There are 2 aspects to be fulfilled:

• The None values should be placed to the end of result list (done in the named answer)

• ... list ... can contain any type of values (answer given by @Andrew Clark doesn't solve it because - for example - sorting of the list:
  [None, 1, '1', False]
  will fail.

Here is the universal solution, which will do the job:

sorted(l, key=lambda x: (x is None, str(type(x)), x))

If it's not needed to place the None values to the end of result list, the code is:

sorted(l, key=lambda x: (str(type(x)), x))

Main idea: group elements by their type and sort only elements within same type.
In case a further special handling required by sorting (e.g. try to check whether string value contains only integer and then sort it as if it would be an integer) - an extra own key-function might be needed.
Hope - it helps ;-)