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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def convert2wavenumber(self):
 """ Convert from wavelengths to wavenumber. Units: Wavelength: micro meters (1e-6 m) Wavenumber: cm-1 """

        self.wavenumber = 1. / (1e-4 * self.wavelength[::-1])
        self.irradiance = (self.irradiance[::-1] *
                           self.wavelength[::-1] * self.wavelength[::-1] * 0.1)
        self.wavelength = None