R3683/count_slides.py
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count_slides.py
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			#!/usr/bin/python

			import nbformat
			import io
			import re,sys

			################################################################

			def countSlides(notebook_files):

			notebooks = [ nbformat.read(f, as_version=4) for f in notebook_files ]

			cpt = 0

			for notebook in notebooks:
			cells = notebook['cells']
			for c in cells:
			if not 'slideshow' in c.metadata: continue
			md = c.metadata.slideshow
			if 'slide_type' in md:
			if md.slide_type == 'slide': cpt += 1
			if md.slide_type == 'subslide': cpt += 1

			return cpt


			################################################################

			if __name__ == "__main__":
			notebook_files = sys.argv[1:]
			nb_slides = countSlides(notebook_files)
			print "found {0} slides".format(nb_slides)

			################################################################