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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)rWr r\encode)rtutoutr'r'r(r 8s    cCsH|dddd}|dks*|dr.dS|dks@|drDd S|S) z(Imitates get_normal_name in tokenizer.c.N _rzutf-8zutf-8-)zlatin-1z iso-8859-1z iso-latin-1)zlatin-1-z iso-8859-1-z iso-latin-1-z iso-8859-1)lowerreplace startswith)orig_encencr'r'r(_get_normal_nameSs rcsy jjWntk r$dYnXdd}d}fdd}fdd}|}|trpd|d d}d }|s||gfS||}|r||gfSt|s||gfS|}|s||gfS||}|r|||gfS|||gfS) a The detect_encoding() function is used to detect the encoding that should be used to decode a Python source file. It requires one argument, readline, in the same way as the tokenize() generator. 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NFzutf-8cs yStk rdSXdS)Nr5) StopIterationr')readliner'r( read_or_stopvsz%detect_encoding..read_or_stopcsy|d}Wn4tk rBd}dk r6d|}t|YnXt|}|sVdSt|d}y t|}Wn:t k rdkrd|}n d|}t|YnXr|dkr؈dkrd}n d}t||d 7}|S) Nzutf-8z'invalid or missing encoding declarationz {} for {!r}rXzunknown encoding: zunknown encoding for {!r}: {}zencoding problem: utf-8z encoding problem for {!r}: utf-8z-sig) decodeUnicodeDecodeErrorr` SyntaxError cookie_rematchrr4r LookupError)r{ line_stringmsgrr\codec) bom_foundfilenamer'r( find_cookie|s6     z$detect_encoding..find_cookieTz utf-8-sig)__self__nameAttributeErrorrrblank_rer)rr\defaultrrfirstsecondr')rrrr(r ^s8   &       cCsVt|d}y0t|j\}}|dt||dd}d|_|S|YnXdS)zXOpen a file in read only mode using the encoding detected by detect_encoding(). rbrT)line_bufferingr:N) _builtin_openr rseekrmodeclose)rbufferr\linestextr'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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