string = 'Strings are defined as ordered collections of characters.'
string[:]
'Strings are defined as ordered collections of characters.'
string[0:2]
'St'
string[:2]
'St'
string[-3:]
'rs.'
string[2:4]
'ri'
string[0:9:2]
'Srnsa'
string[::-1]
'.sretcarahc fo snoitcelloc deredro sa denifed era sgnirtS'