fixed the issue in #451 (#458)
fixed the issue in #451 (#458)

The reason why this bug occurs when having python_binary inside of third_party/python is because we use our own spec loader ModuleDirImport within the third_party/python, instead of the builtin python one _frozen_importlib_external.SourceFileLoader.
By adding a get_code method in ModuleDirImport should solve the problem.

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