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Challenge 23: RGB to Hex

curriculum/challenges/english/blocks/daily-coding-challenges-python/6821ebfd237de8297eaee799.md

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--description--

Given a CSS rgb(r, g, b) color string, return its hexadecimal equivalent.

Here are some example outputs for a given input:

InputOutput
"rgb(255, 255, 255)""#ffffff"
"rgb(1, 2, 3)""#010203"
  • Make any letters lowercase.
  • Return a # followed by six characters. Don't use any shorthand values.

--hints--

rgb_to_hex("rgb(255, 255, 255)") should return "#ffffff".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(rgb_to_hex("rgb(255, 255, 255)"), "#ffffff")`)
}})

rgb_to_hex("rgb(1, 11, 111)") should return "#010b6f".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(rgb_to_hex("rgb(1, 11, 111)"), "#010b6f")`)
}})

rgb_to_hex("rgb(173, 216, 230)") should return "#add8e6".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(rgb_to_hex("rgb(173, 216, 230)"), "#add8e6")`)
}})

rgb_to_hex("rgb(79, 123, 201)") should return "#4f7bc9".

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(rgb_to_hex("rgb(79, 123, 201)"), "#4f7bc9")`)
}})

--seed--

--seed-contents--

py
def rgb_to_hex(rgb):

    return rgb

--solutions--

py
def rgb_to_hex(rgb):
    import re
    match = re.findall(r'\d+', rgb)
    r, g, b = [max(0, min(255, int(x))) for x in match[:3]]
    return f'#{r:02x}{g:02x}{b:02x}'