Is there any way to count all latin characters in utf-8 as 1 byte?

I use searchpos() to capture start/endcolumns of a matches.
Then I use the results in Python code to transform the text.

However I noted that latin characters as 'èéàòìù' are counted as 1 byte in Python but 2 bytes in Vim and the output is not as expected.

Is there any way to resolve this problem?

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