DOC: Add 'import numpy as np' to the 'Examples' section of docstrings.

It was recently decided that we would add the explicit import of numpy in the ‘Examples’ section of our docstrings. (See the discussion in https://github.com/scipy/scipy/issues/13049.) Some progress has been made towards doing this consistently throughout SciPy, but there are still many functions and methods that need to be updated.

I created a script called find_missing_import_np.py that finds functions and methods that are missing the import. Previously stored in a gist, the script is now in my github repo analyze-scipy-code.

Here is the output when I run it with the SciPy main development branch (6-November-2022):

scipy version 1.10.0.dev0+2152.55452d1


Found 0 objects missing 'import numpy as np'

🎉

[WarrenWeckesser]

Thanks @BassCoder2808, but in fact I am about to submit a pull request to finish these off. The main purpose of the pull request will be to fix a bunch of other issues in the docstrings in scipy.signal, but as long as I’m fixing docs, I might as well fix the few remaining cases of missing import numpy as np.

[WarrenWeckesser]

Just to be clear: https://github.com/scipy/scipy/pull/17115 is almost done, and after that is merged, there won’t be a lot of examples left to fix.