readNode = nuke.createNode('Read')
reformatNode = nuke.createNode('Reformat')
writeNode = nuke.createNode('Write')

input =  '/Users/Wouter/Desktop/'
output = '/Users/Wouter/Desktop/'
path = listdir(input)[0] + '/beauty'

inputFile = listdir(path)[0]

inputFile.split('_')
splittedFilename = list.split('_')
seqscene =  splittedFilename[0] + '_' + splittedFilename[1]

if not outputFolderPath.endswith(os.sep):
    outputFolderPath += os.sep

readNode.knob('file').setValue(input)
readNode.knob('on_error').setValue('nearest frame')

reformatNode.knob('type').setValue('scale')
reformatNode.knob('scale').setValue(.5)

writeNode.knob('file_type').setValue('png')
writeNode.knob('colorspace').setValue('sRGB')
writeNode.knob('file').setValue(output + seqscene + '_thumbnail.png')

nuke.execute(writeNode.name(), start=1, end=1, incr=1)