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import os

def get_block_devices():
    block_devices = []
    devices = os.listdir('/sys/block/')
    for device in devices:
        if device.startswith('sd') or device.startswith('nvme'):
            device_path = os.path.join('/sys/block/', device)
            with open(os.path.join(device_path, 'size')) as f:
                size = int(f.read().strip()) * 512 / 1024 / 1024 / 1024
            block_devices.append({'device': device, 'size': size})
    return block_devices

if __name__ == '__main__':
    block_devices = get_block_devices()
    for device in block_devices:
        print('Device: %s, Size: %.2fGB' % (device['device'], device['size']))

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