of is completely transparentand (the defaultis completely opaque by setting alpha to we make the red and blue plot lines appear lighter at we pass fill_between(the list dates for the -values and then the two -value series highs and lows the facecolor argument determines the color of the shaded regionand we give it low alpha value of so the filled region connects the two data series without distracting from the information they represent figure - shows the plot with the shaded region between the highs and lows figure - the region between the two data sets is shaded the shading helps make the range between the two data sets immediately apparent error-checking we should be able to run the code from highs_lows py using data for any location but some weather stations occasionally malfunction and fail to collect some or all of the data they're supposed to missing data can result in exceptions that crash our programs if we don' handle them properly for examplelet' see what happens when we attempt to generate temperature plot for death valleycalifornia copy the file death_valley_ csv to the folder where you're storing this programsand then change highs_lows py to generate graph for death valleyhighs_lows py --snip-get dateshighand low temperatures from file filename 'death_valley_ csvwith open(filenameas --snip-downloading data