Simplifying the function and adding a docstring with an example:
def f(i, v1):
r"""
Return a copy of this list with elements of index `i` and `i + 1`
swapped.
EXAMPLE::
sage: l = [5, 4, 3, 2, 1, 0]
sage: f(3, l)
[5, 4, 3, 1, 2, 0]
"""
v = list(v1)
v[i], v[i+1] = v[i+1], v[i]
return v
Thanks to the docstring, one can now obtain the documentation
of the function with the usual question mark:
sage: f?
or the help function
sage: help(f)
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