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| :mod:`whichdb` --- Guess which DBM module created a database |
| ============================================================ |
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| .. module:: whichdb |
| :synopsis: Guess which DBM-style module created a given database. |
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| The single function in this module attempts to guess which of the several simple |
| database modules available--\ :mod:`dbm`, :mod:`gdbm`, or :mod:`dbhash`\ |
| --should be used to open a given file. |
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| .. function:: whichdb(filename) |
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| Returns one of the following values: ``None`` if the file can't be opened |
| because it's unreadable or doesn't exist; the empty string (``''``) if the |
| file's format can't be guessed; or a string containing the required module name, |
| such as ``'dbm'`` or ``'gdbm'``. |
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