How to quickly convert from items in a list of lists to list of dictionaries in python?

You can use list comprehension to perform an operation on each element of a list, the zip builtin function to match each element of headers against the corresponding element in listoflist, and the dict builtin function to convert each of those into a dictionary. So, the code you want is

listofobj = [dict(zip(headers, sublist)) for sublist in listoflist]

Removing None values is probably best done in another function:

def without_none_values(d):
  return {k:d[k] for k in d if d[k] is not None}

With that function, we can complete the list with

listofobj = [without_none_values(dict(zip(headers, sublist))) for sublist in listoflist]