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f(s,b=1<0b=0)=[c∈"aA" ? b=!b=32-b : print(c+32isletterc+isletter(c)sign('_'-c)b) for c=s]
Try it online!
Stolen and improved from Simeon Schaub's great answer
Try it online!-2 bytes thanks to Czylabson Asa
f(s,b=1<0)=[c∈"aA" ? b=!b : print(c+32isletter(c)sign('_'-c)b) for c=s]
f(s,b=0)=[c∈"aA" ? b=32-b : print(c+isletter(c)sign('_'-c)b) for c=s]
-2 bytes thanks to Czylabson Asa
