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`shelve.open(tempfile.mkstemp()[1])` fails with error "anydbm.error: db type could not be determined" which is not explainable with the docs. Traceback is
 Traceback (most recent call last):
 File "./cudaminer_param_checker.py", line 720, in <module>
 plac.call(cudaminer_param_checker)
 File "/usr/local/lib/python2.7/dist-packages/plac_core.py", line 309, in call
 cmd, result = parser_from(obj).consume(arglist)
 File "/usr/local/lib/python2.7/dist-packages/plac_core.py", line 195, in consume
 return cmd, self.func(*(args + varargs + extraopts), **kwargs)
 File "./cudaminer_param_checker.py", line 715, in cudaminer_param_checker
 visualize_cudaminer_param_checker_results_wxpython_gui()
 File "./cudaminer_param_checker.py", line 365, in visualize_cudaminer_param_checker_results_wxpython_gui
 frame = CudaminerParamChecker(None, )
 File "./cudaminer_param_checker.py", line 378, in __init__
 self.generator = CudaminerParamCheckerGenerator()
 File "./cudaminer_param_checker.py", line 160, in __init__
 self.result_dict= shelve.open(storage_file_path) 
 File "/usr/lib/python2.7/shelve.py", line 239, in open
 return DbfilenameShelf(filename, flag, protocol, writeback)
 File "/usr/lib/python2.7/shelve.py", line 223, in __init__
 Shelf.__init__(self, anydbm.open(filename, flag), protocol, writeback)
 File "/usr/lib/python2.7/anydbm.py", line 82, in open
 raise error, "db type could not be determined"
 anydbm.error: db type could not be determined