1. According to https://www.sqlite.org/lockingv3.html, POSIX advisory locking is known to be buggy or even unimplemented on many NFS implementations (including recent versions of Mac OS X) and that there are reports of locking problems for network filesystems under Windows. So, the rule of thumb is to …

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1. Call the package outside it

2. Add .. into sys.path.

   :::python import sys sys.path.append("..")

References

beyond top level package error in relative import

How to do relative imports in Python …