Convention for global parameter in python module

I have a module with several plotting functions and I want to have two color themes, one with light color and the other with dark color.

I say I have two methods:

def plot_function_1(color_dark='#212121'):
    ...

def plot_function_2(color_dark='#212121'):
    ...

That feels kind of redundant. What is the most pythonic way to deal with this? Would I define a variable in the module COLOR_DARK = '#212121' and then call:

def plot_function_1(color_dark=COLOR_DARK):
    ...

Solution

Create a dict of colors and pass the one required.

color_dict = {'COLOR_DARK': '#212121', 'COLOR_LIGHT': '#121212'}

def plot_function_1(color):
    print(color)


plot_function_1(color_dict['COLOR_DARK'])

OUTPUT:

#212121

Another approach (using enum):

from enum import Enum

class Color(Enum):
    DARK_COLOR = 200
    LIGHT_COLOR = 400
    DARKER_COLOR = 500
    LIGHTER_COLOR = 222

    print(Color.DARK_COLOR.name)
    print(Color.DARK_COLOR.value)

OUTPUT:

DARK_COLOR
200

Similarly:

def plot_function_1(color):
    print(color)


plot_function_1(Color.DARK_COLOR.name)    # or use .value if required