eryksun added the comment:
You're passing an already decoded string, so the BOM is treated as text.
Instead open the file in binary mode, i.e. open("bom3.py", "rb"). This way the
BOM will be detected when decoding the source bytes. Here's an example that
passes the source as a bytes object:
>>> source = b'\xef\xbb\xbf#coding: utf-8\nprint("spam")'
>>> code = compile(source, '<string>', 'exec')
>>> exec(code)
spam
Or you could also decode the file contents without the BOM via open("bom3.py",
encoding="utf-8-sig").
----------
nosy: +eryksun
resolution: -> not a bug
stage: -> resolved
status: open -> closed
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25051>
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