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Round-trip invariant for full input: Untokenized source will match input source exactly Round-trip invariant for limited input: # Output bytes will tokenize back to the input t1 = [tok[:2] for tok in tokenize(f.readline)] newcode = untokenize(t1) readline = BytesIO(newcode).readline t2 = [tok[:2] for tok in tokenize(readline)] assert t1 == t2 N)r]r raencode)rvutoutr-r-r.r =s    cCsH|ddjjdd}|dks*|jdr.dS|d ks@|jdrDdS|S)z(Imitates get_normal_name in tokenizer.c.N _rzutf-8zutf-8-latin-1 iso-8859-1 iso-latin-1latin-1- iso-8859-1- iso-latin-1-)rrr)rrr)lowerreplace startswith)orig_encencr-r-r._get_normal_nameXs rc sy jjWntk r$dYnXdd}d}fdd}fdd}|}|jtrpd|d d}d }|s||gfS||}|r||gfStj|s||gfS|}|s||gfS||}|r|||gfS|||gfS) a The detect_encoding() function is used to detect the encoding that should be used to decode a Python source file. It requires one argument, readline, in the same way as the tokenize() generator. 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NFzutf-8c s yStk rdSXdS)N) StopIterationr-)readliner-r. read_or_stop{sz%detect_encoding..read_or_stopcsy|jd}Wn4tk rBd}dk r6dj|}t|YnXtj|}|sVdSt|jd}y t|}Wn:t k rdkrd|}n dj|}t|YnXr|dkr؈dkrd}n dj}t||d 7}|S) Nzutf-8z'invalid or missing encoding declarationz {} for {!r}rzunknown encoding: zunknown encoding for {!r}: {}zencoding problem: utf-8z encoding problem for {!r}: utf-8z-sig) decodeUnicodeDecodeErrorre SyntaxError cookie_rematchrr:r LookupError)r} line_stringmsgrracodec) bom_foundfilenamer-r. find_cookies6     z$detect_encoding..find_cookieTrz utf-8-sig)__self__nameAttributeErrorrrblank_rer)rradefaultrrfirstsecondr-)rrrr.r cs8   &       c CsVt|d}y0t|j\}}|jdt||dd}d|_|S|jYnXdS)zXOpen a file in read only mode using the encoding detected by detect_encoding(). rbrT)line_bufferingr?N) _builtin_openr rseekrmodeclose)rbufferralinestextr-r-r.rs  rcCsBddlm}m}t|\}}t|d}|d}t||||j|S)a The tokenize() generator requires one argument, readline, which must be a callable object which provides the same interface as the readline() method of built-in file objects. 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