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The compile() doc currently says ""This function raises SyntaxError if the compiled source is invalid, and ValueError if the source contains null bytes." And indeed, in repository 3.9, 3.10, 3.11,
>>> compile('0円','','exec')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: source code string cannot contain null bytes
Ditto when run same in a file from IDLE or command line. The exception sometimes when the null is in a comment or string within the code.
>>> '0円'
'\x00'
>>> #0円
>>> compile('#0円','','single', 0x200)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
ValueError: source code string cannot contain null bytes
>>> compile('"0円"','','single', 0x200)
ValueError: source code string cannot contain null bytes
I am puzzled because "0円" and #0円 in the IDLE shell are sent as strings containing the string or comment to compiled with the call above in codeop. There must be some difference in when 0円 is interpreted.