What does the error message "Import 'pandas' could not be resolved from source Pylance" mean?

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The error message "Import 'pandas' could not be resolved from source Pylance" means that the code editor or environment, in this case Pylance, was not able to find the required library/module, which is pandas in this case. This could happen due to various reasons like the library is not installed or not in the correct path/folder, or there is a typo in the import statement, or there is a configuration issue in the code editor/environment.