gfonts-1-rename-columns.py

col_names = {
    "100": "thin",
    "100italic": "thinitalic",
    "200": "extralight",
    "200italic": "extralightitalic",
    "300": "light",
    "300italic": "lightitalic",
    "400": "regular",
    "regular": "regular",
    "400italic": "italic",
    "italic": "italic",
    "500": "medium",
    "500italic": "mediumitalic",
    "600": "semibold",
    "600italic": "semibolditalic",
    "700": "bold",
    "700italic": "bolditalic",
    "800": "extrabold",
    "800italic": "extrabolditalic",
    "900": "black",
    "900italic": "blackitalic"
}
col_names = {k:f'variants_{v}' for k, v in col_names.items()}

df = df.rename(col_names, axis='columns')

df.columns