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Subplot titles - invalid keyword

Hi, I’m trying to give my subplots titles but when I do

fig = tools.make_subplots(rows=total_rows, cols=total_cols, subtitle_plots=sorted(chr7_dict.keys()))

I get the following error:

Traceback (most recent call last): File "plot_map_vs_orig_pos.py", line 110, in <module> fig = tools.make_subplots(rows=total_rows, cols=total_cols, subtitle_plots=sorted(chr7_dict.keys())) File "/Library/Python/2.7/site-packages/plotly/tools.py", line 691, in make_subplots raise Exception("Invalid keyword argument: '{0}'".format(key)) Exception: Invalid keyword argument: 'subtitle_plots'

Is my python maybe too outdated?