code: def LoadDll(location):
      
      if os.path.isfile(location):
          global dna_dll
          dna_dll = cdll.LoadLibrary(location)
      else:
          raise Exception("ERROR- file does not exist at " + location)
docs: If the EzDnaApi64.dll file is not in the default location
      (C:\Program Files (x86)\eDNA\EzDnaApi64.dll) then the user must specify
      the correct location of the file, before this module can be used.
  
      :param location: the full location of EzDnaApi64.dll, including filename