Martin Panter added the comment: Python 3 will only use UTF-8 encoding if you ask it to, or if the default locale encoding happens to be UTF-8. I suspect one of the file names in the “hay” list must contain a Unicode hyphen (U+2010), and your default encoding is some single byte encoding that cannot encode the hyphen. If you definitely want to write a UTF-8 file, use the open(encoding="utf-8") parameter.
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