Confused - how to change color scheme for this map?

📊 Plotly Python
1 
import plotly.figure_factory as pff
import os

def make_images(arglist):
    df, endpts, map, type, scale = arglist
    datelist = df.index.tolist()
    for ddate in datelist:
        dlist = ddate.split('/')
        datenow = '20' + dlist[2] + dlist[0].rjust(2, '0') + dlist[1].rjust(2, '0')
        datenowslash = '20' + dlist[2] + '/' + dlist[0].rjust(2, '0') + '/' + dlist[1].rjust(2, '0')

        fig = pff.create_choropleth(
            fips=df.columns.tolist(),
            values=df.loc[ddate],
            scope=[map],
            county_outline={'color': 'rgb(0,0,0)', 'width': 0.5},
            binning_endpoints=endpts,
        )

        fig.update_layout(
            autosize=False,
            width=2000,
            height=1066,
            showlegend=False,
            title={
              'text': '<b>stuff goes here</b>',
              'y': 0.2,
              'x': 0.1,
              'xanchor': 'left',
              'yanchor': 'middle'},
        )

        imgpath = os.path.join(type.replace(' ', '_'), 'frame-' + datenow + '.png')

        fig.write_image(imgpath, scale=1.0)

df has one column for each county, and one line for each date. I cycle through lines and make one image (map) per date.

It seems to use a continuous color scheme, and it looks quite similar to Viridis. How can I change that? I want to use Inferno instead. I spent a lot of time digging through the documentation, to no avail. Thanks!