https://plotly.com/python/reference/

In the reference, the attributes are nested. Like in xaxis > title > font > color, family, size, ... So if I were to change the size of the xaxis's title, I would get the attribute like this, xaxis_title_font_size = 12. This is really the whole gist. You can read more details here, https://plotly.com/python/reference/index/