Page 60, Creating and Accessing Single-Dimension Arrays,
The description in the paragraph after this statement is wrong. Python/IronPython does not make a copy of the content of a list. Instead, the memory reference of the original list is assigned to the new variable. If you try to change the content in MyList, sys.path also got changed. I have tested and conformed this on my machine, running IronPython 2.6.2 on .Net 4.0