[Solved] Why it doesn’t return anything?

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def esvocal(letter):
    vocal =[ "a","e","i","o","u"]
    vocalup = ["A","E","I","O","U"]

    if letter in vocal and letter in vocalup:
        return True
    else:
        return False 
esvocal("s")
esvocal("a")
  1. Python really cares about indentation
  2. Use in instead of ==

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solved Why it doesn’t return anything?