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Populate fields using python

Question asked by gus6177 on Oct 1, 2015
Latest reply on Oct 2, 2015 by jskinner-esristaff
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I'm new to python and trying to figure out if this is possible.  I have a measured layer with segments in it.  I want to add a begin segment and end segment field.  The layer has the following fields.  Corridor, Ref Marker, shape length, beg_seg and end_seg.  I would like to populate the begin seg and end seg from the shape_length field and accumulate them.  So the mile post zero beg_seg would start at zero and the end_seg field would be the length of the zero segment.  Then mile post 1 beg_seg would be the value of the end_seg of mile post one.  The end_seg for mile post one would be the value of mile post 0 length plus the length of mile post one.  this would continue till the last mile post.  I have attached a image of the table that I manually entered the values for.  I was hoping to create a python script to perform this as I have a ton of corridors with a ton of records.  One other piece of information is some of the corridors may be missing mile posts.