def isOdd(n: int) -> bool:
    """Return True if n is odd, False otherwise."""
    return not n % 2 == 0


print("Testing isOdd()...", end="")
assert isOdd(123) == True
assert isOdd(124) == False
assert isOdd(1) == True
assert isOdd(0) == False
assert isOdd(-123) == True
assert isOdd(-124) == False
assert isOdd(-1) == True
print("Passed!")