presentation of non-ascii characters (ñ)
Is mysql_json_data.py input or output or code or a dump?

'MA\xd1ANA... has Ñ encoded in latin1 (and perhaps escaped for display?)
'Ma\xc3\xb1ana... has ñ encoded in utf8 (and perhaps escaped for display?)

If you have one file with both in it, you have a mess.

The former will probably be truncated as you attempt to put it into your MySQL table.  The latter will probably insert correctly.

See my notes on Python.