[Python] What's the best way to import a module from a directory that's not a package? [closed]

My directory structure:

dir/
build.py
dir2
dir3/
packages.py


build.py needs packages.py. dir2 is not a package. What's the best way to get packages.py loaded into build.py (the directory structure can't be changed)?

The sys.path.append solution seems good but I need to use the packages.py file rarely and keeping a sys.path that includes a directory used rarely, but is at the front, is that the best thing?

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