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str.swapcase();

#!/usr/bin/python

str = "tutorialpro!!!";
print ( str.swapcase() );

str = "tutorialpro!!!";
print ( str.swapcase() );

str = "abCDE--tutorialpro!!!";
print ( str.swapcase() );

TUTORIALPRO!!!
TUTORIALPRO!!!
ABcde--tutorialpro!!!