Color Range Python

Question

I want to know how I can get a color depending on a value between [0-100] where 0 is red and 1 is green and I want values between them to be interpolated colors between red and green (orange, yellow...,..). I'm using python in Blender 3D. The below lines of code can generate rainbow colors as shown here but I wonder how I can set it to only between red, yellow and green and also how to control my range of colors (0-100)

import colorsys
(r, g, b) = colorsys.hsv_to_rgb(float(depth) / maxd, 1.0, 1.0)
R, G, B = int(255 * r), int(255 * g), int(255 * b)

Answer 1

Easy. On the 0 - 1 scale that colorsys uses, the hue of red is 0 and the hue of green is 1/3, so you just need to reduce your numbers in the [0 - 100] range to the [0 - 1/3] interval by dividing.

Like this:

import colorsys

for i in range(101):
    rgb = colorsys.hsv_to_rgb(i / 300., 1.0, 1.0)
    print(i, [round(255*x) for x in rgb])

output

0 [255, 0, 0]
1 [255, 5, 0]
2 [255, 10, 0]
3 [255, 15, 0]
4 [255, 20, 0]
5 [255, 25, 0]
6 [255, 31, 0]
7 [255, 36, 0]
8 [255, 41, 0]
9 [255, 46, 0]
10 [255, 51, 0]
11 [255, 56, 0]
12 [255, 61, 0]
13 [255, 66, 0]
14 [255, 71, 0]
15 [255, 77, 0]
16 [255, 82, 0]
17 [255, 87, 0]
18 [255, 92, 0]
19 [255, 97, 0]
20 [255, 102, 0]
21 [255, 107, 0]
22 [255, 112, 0]
23 [255, 117, 0]
24 [255, 122, 0]
25 [255, 128, 0]
26 [255, 133, 0]
27 [255, 138, 0]
28 [255, 143, 0]
29 [255, 148, 0]
30 [255, 153, 0]
31 [255, 158, 0]
32 [255, 163, 0]
33 [255, 168, 0]
34 [255, 173, 0]
35 [255, 178, 0]
36 [255, 184, 0]
37 [255, 189, 0]
38 [255, 194, 0]
39 [255, 199, 0]
40 [255, 204, 0]
41 [255, 209, 0]
42 [255, 214, 0]
43 [255, 219, 0]
44 [255, 224, 0]
45 [255, 229, 0]
46 [255, 235, 0]
47 [255, 240, 0]
48 [255, 245, 0]
49 [255, 250, 0]
50 [255, 255, 0]
51 [250, 255, 0]
52 [245, 255, 0]
53 [240, 255, 0]
54 [235, 255, 0]
55 [230, 255, 0]
56 [224, 255, 0]
57 [219, 255, 0]
58 [214, 255, 0]
59 [209, 255, 0]
60 [204, 255, 0]
61 [199, 255, 0]
62 [194, 255, 0]
63 [189, 255, 0]
64 [184, 255, 0]
65 [178, 255, 0]
66 [173, 255, 0]
67 [168, 255, 0]
68 [163, 255, 0]
69 [158, 255, 0]
70 [153, 255, 0]
71 [148, 255, 0]
72 [143, 255, 0]
73 [138, 255, 0]
74 [133, 255, 0]
75 [128, 255, 0]
76 [122, 255, 0]
77 [117, 255, 0]
78 [112, 255, 0]
79 [107, 255, 0]
80 [102, 255, 0]
81 [97, 255, 0]
82 [92, 255, 0]
83 [87, 255, 0]
84 [82, 255, 0]
85 [77, 255, 0]
86 [71, 255, 0]
87 [66, 255, 0]
88 [61, 255, 0]
89 [56, 255, 0]
90 [51, 255, 0]
91 [46, 255, 0]
92 [41, 255, 0]
93 [36, 255, 0]
94 [31, 255, 0]
95 [26, 255, 0]
96 [20, 255, 0]
97 [15, 255, 0]
98 [10, 255, 0]
99 [5, 255, 0]
100 [0, 255, 0]