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Stepping through the code, it seems under ndbm it is creating a file with a '.db' extension:
```
(Pdb) list
 47 	 'g': b'intended',
 48 	 }
 49 	
 50 	 def init_db(self):
 51 	 import pdb; pdb.set_trace()
 52 ->	 with dbm.open(_fname, 'n') as f:
 53 	 for k in self._dict:
 54 	 f[k.encode("ascii")] = self._dict[k]
 55 	
 56 	 def keys_helper(self, f):
 57 	 keys = sorted(k.decode("ascii") for k in f.keys())
(Pdb) n
> /home/asottile/workspace/cpython/Lib/test/test_dbm.py(53)init_db()
-> for k in self._dict:
(Pdb) os.listdir('.')
['@test_8371_tmp.db']
(Pdb) _fname
'@test_8371_tmp'
```