When using an imported library, why does Pylance in VSCode produce a "reportundefinedvariable" error?

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Pylance in VSCode may produce a "reportundefinedvariable" error when using an imported library because it cannot find a definition for a variable or function used in the library. This may happen if the library is not installed correctly or if there is a typo in the code that caused the import statement to fail. It is also possible that Pylance is not configured to recognize the library, which can be fixed by adding the library to the project's Python path or by updating the Pylance settings to include the library.