How to export ExDark in Yolov3 format for training?

[zhengpengen]

I noticed that the bounding boxes were all in pixel values, so I was wondering if there's any way to export/change the ground truth boxes from that to the yolov3 notation other than going into every txt file and manually changing it?

##Yolov3 notation
object class
x value of center of ground truth/image width
y value of center of ground truth/image height
height of ground truth/image width
width of ground truth/image width

Example:
1 0.716797 0.395833 0.216406 0.147222