Ok, after the discussion on the chat, here is the solution (thanks for your
help everyone):
This script opens a Leo file, and traverses its nodes.
exists=0
for com in g.app.commanders():
if 'I_Programming.leo' in com.fileName():
dc = com
exists=1
break
if not exists:
c2 = g.openWithFileName('D:/Dropbox/MY LEO FILES/LEO
FILES/I_Programming/I_Programming.leo',old_c=c)
for com in g.app.commanders():
if 'I_Programming.leo' in com.fileName():
dc = com
exists=1
break
for child in dc.all_unique_positions():
g.es(child.h)
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