invoice = """
0.....6.................................40........52...55........
1909 Pimoroni PiBrella                      $17.50    3    $52.50
1489 6mm Tactile Switch x20                  $4.95    2    $9.90
1510 Panavise Jr. - PV-201                  $28.00    1    $28.00
1601 PiTFT Mini Kit 320x240                 $34.95    1    $34.95
"""

SKU = slice(0, 5)
DESCRIPTION = slice(5, 40)
UNIT_PRICE = slice(40, 52)
QUANTITY = slice(52, 55)
ITEM_TOTAL = slice(55, None)

line_items = invoice.split('\n')[2:]

for item in line_items:
    print(item[UNIT_PRICE], item[DESCRIPTION])

$17.50   Pimoroni PiBrella                  
 $4.95   6mm Tactile Switch x20             
$28.00   Panavise Jr. - PV-201              
$34.95   PiTFT Mini Kit 320x240