特殊文字判定 about jsonica HOT 2 CLOSED

e.g.,  受け取った引数をraw評価したい
In [69]: x = '\xff' # 実際は評価するまで、何が来るかわからない
In [70]: '%s'%x
Out[70]: 'ÿ' >> NG
In [71]: r'%s'%x
Out[71]: 'ÿ' >> NG
In [73]: '{0!r}'.format(x)
Out[73]: "'ÿ'" >> NG
In [74]: '{0!s}'.format(x)
Out[74]: 'ÿ' >> NG
In [75]: '{0!s}'.format(x.encode('unicode-escape').decode('utf-8'))
Out[75]: '\\xff' >> OK
In [76]: '%s'%x.encode('unicode-escape').decode('utf-8')
Out[76]: '\\xff' >> OK
In [81]: f'{x.encode("unicode-escape").decode("utf-8")!r}'
Out[81]: "'\\\\xff'"

In [82]: x
Out[82]: 'ÿ'
In [83]: f'{x.encode("unicode-escape").decode("utf-8")}'
Out[83]: '\\xff'