Is it possible that the file "//filename.py" cannot be accessed in both the Jenkins and Python3 docker containers due to [Errno 2] indicating that the file or directory is nonexistent?

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Yes, it is possible that the file "//filename.py" cannot be accessed in both the Jenkins and Python3 docker containers due to [Errno 2] indicating that the file or directory is nonexistent. This error message usually indicates that the specified file or directory doesn't exist in the given location, or the user does not have sufficient permissions to access it.

To resolve this issue, you should check the path of the file and make sure it exists in both containers. You can also try giving appropriate file or directory permissions to the user running both containers.