Designer Mary wants to convert her CSS from statements like
background-color: rgb(128, 128, 0);to:
Don't worry, you don't have to rewrite CSS, just complete the
rgb_to_hexhelper for her that takes a tuple of RGB (3 ints) and converts it to the corresponding hex value.
For example for Maroon you would call it like
rgb_to_hex((128, 0, 0))and it would return the hex
Make sure you check that each r, g and b int is within the valid range of 0 and 255 (both included), if not raise a
ValueError, Explicit is better than implicit (Zen).
Check the TESTS tab for more examples, there we check your code for 16 colors and 3 excepions. Have fun!