Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
Initially, the default __format__ converted the object to str and passed format
specifier to str.__format__. This is defined in PEP 3101:
class object:
def __format__(self, format_spec):
return format(str(self), format_spec)
But later we changed the implementation, because this leaded to difficult to
catch errors. Non-empty format specifier is now error in the default __format__.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38222>
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