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Pu
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Pu is a joke esolang with no practical purpose idk
commands
p | Hello, world!
[ | print "pu"
] | print "up"
u | prints !drlow ,olleH
Any other character prints "Pu".
python interpreter
for c in input():print({"p":"Hello, world!","[":"pu","]":"up","u":"!dlrow ,olleH"}.get(c,"Pu"))
examples
Hello, world!
p
Hello, world! backwards
u
idk
pu[]abc