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TypeError: startswith first arg must be str or a tuple of str, not bytes
In line 558 of plistlib.py at the beginnging of "def _is_fmt_xml(header)" is the problem, caused by the use of the byte arguments defined in line 555 (prefixes = (b'<?xml', b'<plist')).
Similar Problem in line 572:
header.startswith(bom). bom is of type bytes.
FIX: change the definition to:
line 555: prefixes = ('<?xml', '<plist')
line 572: header.startswith(str(bom))
Remaining problem is:
TypeError: read() did not return a bytes object (type=str)
This occurs in the parser object generated by ParserCreate() from xml.parsers.expat
I stopped there with tracing / resolving the problem.