Similar RGB Color Python Solution with Tests

lcpy gen -n 800   # by problem number
lcpy gen -s similar_rgb_color   # by problem name

Input: color = "#09f166"
Output: "#11ee66"
Explanation:
The similarity is -(0x09 - 0x11)^2 -(0xf1 - 0xee)^2 - (0x66 - 0x66)^2 = -64 -9 -0 = -73.
This is the highest among any shorthand color.

Input: color = "#4e3fe1"
Output: "#5544dd"

class Solution:
    # Time: O(1)
    # Space: O(1)
    def similar_rgb(self, color: str) -> str:
        def nearest(channel: str) -> str:
            val = int(channel, 16)
            q = val // 17 + (1 if val % 17 > 8 else 0)
            return f"{17 * q:02x}"

        return "#" + "".join(nearest(color[i : i + 2]) for i in (1, 3, 5))