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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 readable_os_version():
 """Give a proper name for OS version :return: Proper OS version :rtype: str """

    if platform.system() == 'Linux':
        return _linux_os_release()
    elif platform.system() == 'Darwin':
        return ' {version}'.format(version=platform.mac_ver()[0])
    elif platform.system() == 'Windows':
        return platform.platform()