Find name of maximum rgb element in a string

max_rgba.py

r = r'^rgba\((?P<red>\d+), (?P<green>\d+), (?P<blue>\d+), \d\.\d+\)$'

def max_rgba(color):
    keys = ('red', 'green', 'blue')
    d = {
        k: int(v)
        for k, v in zip(
            keys,
            re.search(r, color).group(*keys)
        )
    }
    return max(d.items(), key=lambda x: x[1])[0]

print(max_rgba('rgba(127, 191, 65, 1.0)'))