[docs] [issue23174] shelve.open fails with error "anydbm.error: db type could not be determined"

[R. David Murray]

R. David Murray added the comment:

You are opening a just-created empty file.  The db type of the file cannot, therefore, be determined.  Which is what the error message says. 

How would you suggest the error message be improved?

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nosy: +r.david.murray

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<http://bugs.python.org/issue23174>
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