What does the following message mean: "pydot cannot be imported and installation of pydot and graphviz is necessary for `pydotprint` to function"?

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The message means that a Python package called "pydot" needs to be installed along with another package called "graphviz" in order for a function called "pydotprint" to work properly. The error message indicates that the "pydot" package cannot be imported, which suggests that it is either not installed or there is an issue with the installation.