Help Get rope/rod stretch lengh?

[JhonatasFarias]

Hi there, is there a way i can identify/get the lenght of a rope or rod via script?

i mean like in stationary pose it is about 100% long... then streching it i see it's something like 120% long from initial pose... or initial pose is 1m then streching it's about 1.2m... 1.3m...