11.7. whichdb — Guess which DBM module created a database
The whichdb module’s only function has been put into the dbm
module in Python 3. The 2to3 tool will automatically adapt imports
when converting your sources to Python 3.
The single function in this module attempts to guess which of the several simple
database modules available–dbm, gdbm, or dbhash–should be used to open a given file.
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'.