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Strings
Case

Make a string uppercase

Transform "Space Monkey" into "SPACE MONKEY"
python
"Space Monkey".upper()

Make a string lowercase

Transform "Caps ARE overRated" into "caps are overrated"
python
"Caps ARE overRated".lower()

Capitalise the first letter of each word

Transform "man OF stEEL" into "Man Of Steel"
python
from string import capwords
capwords("man OF stEEL")
' '.join(s.capitalize() for s in "man OF stEEL".split())
"man OF stEEL".title()