Martin Panter added the comment:
I’m actually trying out your patch now. A couple strange errors and
observations:
>>> f"{'{'}" # Why is this allowed in an outer format expression--
'{'
>>> f"{3:{'{'}>10}" # --but not inside a format specifier?
SyntaxError: nesting of '{' in format specifier is not allowed
>>> opening = "{"; f"{3:{opening}>10}" # Workaround
'{{{{{{{{{3'
>>> f"{3:{'}'}<10}" # Error message is very strange!
SyntaxError: missing '}' in format string expression
>>> f"{\x00}" # It seems this is treated as a null terminator
File "<fstring>", line 1
(
^
SyntaxError: unexpected EOF while parsing
>>> f"{'s'!\x00:.<10}" # Default conversion is the null character?
's.........'
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<http://bugs.python.org/issue24965>
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