将 RGB 颜色转换为 RGBA 的绘图函数？ （Python）

Question

As far as my limited knowledge of Plotly goes, it represents colours as strings like "rgb(23, 57, 211)" , or "rgba(23, 57, 211, 0.5)" , but I can't find a function that converts from RGB to RGBA. I want this function because I want to add an alpha channel to an RGB colour in DEFAULT_PLOTLY_COLORS" defined in colors.py . I know it's very simple string manipulation and I can write my own function, but is there an official Plotly function to do this?

Answer 1

As of today, no such function exists to my knowledge. For anyone looking for a solution, this worked just fine for me

def rgb_to_rgba(rgb_value, alpha):
    """
    Adds the alpha channel to an RGB Value and returns it as an RGBA Value
    :param rgb_value: Input RGB Value
    :param alpha: Alpha Value to add  in range [0,1]
    :return: RGBA Value
    """
    return f"rgba{rgb_value[3:-1]}, {alpha})"