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The vestigial pelvis in pythons is not attached to vertebrae (as is the normal case in most vertebrates), and it simply floats in the abdominal cavity.
Note that the exact evolutionary mechanism which created a vestigial structure is irrelevant as long as the mechanism is a gradual one. Most pythons (which are legless snakes) carry vestigial pelvises hidden beneath their skin (Cohn 2001; Cohn and Tickle 1999).
A vestige is defined, independently of evolutionary theory, as a reduced and rudimentary structure compared to the same complex structure in other organisms. Over sixty years before Darwin's publication of On the Origin of Species, the eminent French anatomist Geoffroy St. Thus, under the skin of the Cassowary's flanks are the vestiges of the wings ..." (Geoffroy 1798) Geoffroy was at a loss for why exactly nature "always leaves vestiges of an organ", yet he could not deny his empirical observations.