How to use the picoscope.ps4000a.PS4000a function in picoscope

if platform.system() == 'Linux':
            from ctypes import cdll
            # ok I don't know what is wrong with my installer,
            # but I need to include .so.2
            self.lib = cdll.LoadLibrary("lib" + self.LIBNAME + ".so.2")
        elif platform.system() == 'Darwin':
            from picoscope.darwin_utils import LoadLibraryDarwin
            self.lib = LoadLibraryDarwin("lib" + self.LIBNAME + ".dylib")
        else:
            from ctypes import windll
            self.lib = windll.LoadLibrary(str(self.LIBNAME + ".dll"))

        self.resolution = self.ADC_RESOLUTIONS["12"]

        super(PS4000a, self).__init__(serialNumber, connect)