Import "matplotlib.pyplot" could not be resolved from source

As an AI language model, I cannot see your code or know which environment you are using. However, this error message usually appears when there is an issue with the installation of matplotlib library or the library is not imported correctly.

Here are some possible solutions:

1. Make sure that you have installed matplotlib library correctly. You can use the following command to install it:

   pip install matplotlib

2. If you have already installed matplotlib, try restarting your editor or IDE.

3. Check if you have any typos in the import statement. It should be:

   import matplotlib.pyplot as plt

Note that "pyplot" is a submodule of matplotlib.

4. If none of the above solutions work, try uninstalling and reinstalling matplotlib.

   pip uninstall matplotlib
   pip install matplotlib

If the issue still persists, you may need to provide more information or context for further troubleshooting.