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e p d Ge GHq Wn d S( s0 Guess which db package to use to open a db file.iÿÿÿÿNc C s yq t | t j d d } | j t j d k oB t j d k sl t | t j d d } | j n d SWn| t k
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f k
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rn Xy t | d } Wn t k
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rd SX| d k rd Sd S( sg Guess which db package to use to open a db file.
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Return values:
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- None if the database file can't be read;
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- empty string if the file can be read but can't be recognized
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- the module name (e.g. "dbm" or "gdbm") if recognized.
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Importing the given module may still fail, and opening the
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database using that module may still fail.
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b
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