This is the problem in VSCode: import matplotlib.pyplot as plt # Import "matplotlib.pyplot" could not be resolved from sourcePylancereportMissingModuleSource from mpi4py import MPI # No name 'MPI' in module 'mpi4py'PylintE0611:no-name-in-module However, when I run the code, it works. I've done a search and people talk about the interpreter, however: You can see some part of the pip show matplotlib command and the selected interpreter (3.13.0). And if I open the menu with the options, I can choose between 3.13 and 3.11, being the first one the selected one. Continue reading...