/usr/lib/python3.5/test/cjkencodings/ is in libpython3.5-testsuite 3.5.1-10.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python3.5/test/cjkencodings/big5-utf8.txt
/usr/lib/python3.5/test/cjkencodings/big5.txt
/usr/lib/python3.5/test/cjkencodings/big5hkscs-utf8.txt
/usr/lib/python3.5/test/cjkencodings/big5hkscs.txt
/usr/lib/python3.5/test/cjkencodings/cp949-utf8.txt
/usr/lib/python3.5/test/cjkencodings/cp949.txt
/usr/lib/python3.5/test/cjkencodings/euc_jisx0213-utf8.txt
/usr/lib/python3.5/test/cjkencodings/euc_jisx0213.txt
/usr/lib/python3.5/test/cjkencodings/euc_jp-utf8.txt
/usr/lib/python3.5/test/cjkencodings/euc_jp.txt
/usr/lib/python3.5/test/cjkencodings/euc_kr-utf8.txt
/usr/lib/python3.5/test/cjkencodings/euc_kr.txt
/usr/lib/python3.5/test/cjkencodings/gb18030-utf8.txt
/usr/lib/python3.5/test/cjkencodings/gb18030.txt
/usr/lib/python3.5/test/cjkencodings/gb2312-utf8.txt
/usr/lib/python3.5/test/cjkencodings/gb2312.txt
/usr/lib/python3.5/test/cjkencodings/gbk-utf8.txt
/usr/lib/python3.5/test/cjkencodings/gbk.txt
/usr/lib/python3.5/test/cjkencodings/hz-utf8.txt
/usr/lib/python3.5/test/cjkencodings/hz.txt
/usr/lib/python3.5/test/cjkencodings/iso2022_jp-utf8.txt
/usr/lib/python3.5/test/cjkencodings/iso2022_jp.txt
/usr/lib/python3.5/test/cjkencodings/iso2022_kr-utf8.txt
/usr/lib/python3.5/test/cjkencodings/iso2022_kr.txt
/usr/lib/python3.5/test/cjkencodings/johab-utf8.txt
/usr/lib/python3.5/test/cjkencodings/johab.txt
/usr/lib/python3.5/test/cjkencodings/shift_jis-utf8.txt
/usr/lib/python3.5/test/cjkencodings/shift_jis.txt
/usr/lib/python3.5/test/cjkencodings/shift_jisx0213-utf8.txt
/usr/lib/python3.5/test/cjkencodings/shift_jisx0213.txt