def print_header():
    """Print pretty header of list content

    The head contains 5 columns, each column has a differnt string length.
    """
    headers = ['TASK#', 'SUMMARY', 'LIST TYPE', 'DUE TIME', 'PRIORITY']
    print()
    print('{0:<5}  {1:<60}  {2:<9}  {3:<8}  {4:<8}'.format(*headers))
    print('{0:=<5}  {1:=<60}  {2:=<9}  {3:=<8}  {4:=<8}'.format(*['', '',
        '', '', '']))
