def adder(a, b):
    return a + b
!= can also be written <>, but this is an obsolete usage kept for
dataset/ETHPy150Open rgalanakis/practicalmayapython/src/appendix/doctestexample.py/adder--crossover with--dataset/ETHPy150Open kivy/plyer/plyer/tools/pep8checker/pep8.py/python_3000_not_equal