>>> ['tree', 'bush']
['tree', 'bush']
>>> ['tree', 'bush'][1]
'bush'
>>> ['tree', 'bush'][1].upper()
'BUSH'
>>> ['tree', 'bush'][1].upper().replace('s', 'tc')
'BUSH'
>>> ['tree', 'bush'][1].upper().replace('S', 'tc')
'BUtcH'
>>> ['tree', 'bush'][1].upper().replace('S', 'tc').lower()
'butch'