in util-cell-enumerate.py [0:0]
def renumber_code_cell(code_cell):
global cell_number
# strip any old numbers
code_cell["source"] = [ line_of_code for line_of_code in code_cell["source"] if not has_cell_number.match(line_of_code)]
# add a new number
insert_at_line_number=0 # in general, add to the beginning of the block
if len(code_cell["source"])>0 and code_cell["source"][0].startswith('%%sh'):
# this is rare case where line number cannot be prepended to the block
insert_at_line_number=1
code_cell["source"].insert(insert_at_line_number,'# cell {:02d}\n'.format(cell_number))
cell_number += 1
return code_cell