GrADs maskout equivalent in Python/metpy?

[sgofferj]

Is there any equivalent to the GrADs maskout function in Python or metpy? If not, how would I achieve a similar functionality?

[dopplershift]

Not a function per se but that capability can be done with numpy's boolean indexing support:

a[mask < 0] = np.nan

[sgofferj]

Thanks!