[issue33074] dbm corrupts index on macOS (_dbm module)

[Xiang Zhang]

Xiang Zhang <angwerzx at 126.com> added the comment:

I highly suspect you don't have gdbm installed in your environment and `import dbm.gnu` will fail. When simply using `dbm.open`, it searches through [dbm.gnu, dbm.ndbm, dbm.dumb]. In my environment, macOS 10.13.3, dbm.gnu works correctly(so dbm works correctly) and dbm.ndbm fails with same error. Currently I cannot see any code in Python _dbm module could lead to this error. And POSIX only requires dbm library to support at least 1023 bytes long key/value pairs.

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nosy: +xiang.zhang

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33074>
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