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Minimal example:

Python 3.6.8 (default, Apr  1 2020, 10:29:41) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-39)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from ligo.segments import segmentlist
>>> s = segmentlist([])
>>> type(s)
<class 'ligo.segments.__segments.segmentlist'>
>>> type(s.copy())
<class 'list'>

Note that copy() isn't defined for python 2:

Python 2.7.5 (default, Apr  1 2020, 10:09:19) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-39)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from ligo.segments import segmentlist
>>> s = segmentlist([])
>>> type(s)
<type 'ligo.segments.__segments.segmentlist'>
>>> type(s.copy())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'ligo.segments.__segments.segmentlist' object has no attribute 'copy'