Import "matplotlib" could not be resolved from source Pylance(reportMissingModuleSource)

Question

whenever I try to import matplotlib or matplotlib.pyplot in VS Code I get the error in the title:

Import "matplotlib" could not be resolved from source Pylance(reportMissingModuleSource)

or

Import "matplotlib.pyplot" could not be resolved from source Pylance(reportMissingModuleSource)

The hyperlink of the reportMissingModuleSource sends me to https://github.com/microsoft/pylance-release/blob/main/DIAGNOSTIC_SEVERITY_RULES.md#diagnostic-severity-rules, where it says:
"Diagnostics for imports that have no corresponding source file. This happens when a type stub is found, but the module source file was not found, indicating that the code may fail at runtime when using this execution environment. Type checking will be done using the type stub."
However, from the explanation I don't understand exactly what's wrong and what I should do to fix this, can someone help me with this?

Answer 1

I can reproduce your question when I select a python interpreter where doesn't exist matplotlib:

So, the solution is opening an integrated Terminal then run pip install matplotlib. After it's installed successfully, please reload window, then the warning should go away.

Answer 2

I had the same issue. Sometimes it's back to multiple versions of python on your device. You just need to change the path. Make sure the correct Python interpreter is selected in your IDE.

In vscode Press CTRL + Shift + P or (⌘ + Shift + P on macOS) to open the command palette. Then type Python select interpreter in the search field and choose the right version.