Return our platform name 'win32', 'linux_x86_64

def get_platform():
    # type: () -> str
    """Return our platform name 'win32', 'linux_x86_64'"""
    if sys.platform == 'darwin':
        # distutils.util.get_platform() returns the release based on the value
        # of MACOSX_DEPLOYMENT_TARGET on which Python was built, which may
        # be significantly older than the user's current machine.
        release, _, machine = platform.mac_ver()
        split_ver = release.split('.')

        if machine == "x86_64" and _is_running_32bit():
            machine = "i386"
        elif machine == "ppc64" and _is_running_32bit():
            machine = "ppc"

        return 'macosx_{}_{}_{}'.format(split_ver[0], split_ver[1], machine)

    # XXX remove distutils dependency
    result = distutils.util.get_platform().replace('.', '_').replace('-', '_')
    if result == "linux_x86_64" and _is_running_32bit():
        # 32 bit Python program (running on a 64 bit Linux): pip should only
        # install and run 32 bit compiled extensions in that case.
        result = "linux_i686"

    return result