idx-edx: Different Character count in Vim and Python

Example:

s="I like crème caramel but not only caramel I also like crème fraîche."

Searching the idx-edx numbers of the matches of the word "crème":
echo matchstrpos(s, "crème") --> 7,13
echo matchstrpos(s, "crème",14) --> 55,61

I do have a python function in which I transform the above string using slices.
But the problem is that in python accented letters are counted as 1
and in Vim as 2, my slicing goes wrong.

How can I resolve this problem?

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