A slice object can be passed in place of an index.
cut = slice(4, 11)
text = "The unknown unknown"
text[cut]
'unknown'
Useful in processing strings.
field_1 = "Bananas, oranges 101 134,23 £11,23"
field_2 = "Apples, pineapples 102 234,53 £14,13"
field_3 = "Kiwi fruit 103 13,03 £2,99"
DESCRIPTION = slice(0, 22)
print(field_1[DESCRIPTION])
print(field_3[DESCRIPTION])
Bananas, oranges
Kiwi fruit
a = list(range(7))
a
[0, 1, 2, 3, 4, 5, 6]
a[2:4] = [12, 14]
a
[0, 1, 12, 14, 4, 5, 6]
del a[4:]
a
[0, 1, 12, 14]
If you spot any errors please let me know on twitter.