## The challenge

The rgb function is incomplete. Complete it so that passing in RGB decimal values will result in a hexadecimal representation being returned. Valid decimal values for RGB are 0 – 255. Any values that fall out of that range must be rounded to the closest valid value.

Note: Your answer should always be 6 characters long, the shorthand with 3 will not work here.

The following are examples of expected output values:

 ``````1 2 3 4 `````` ``````rgb(255, 255, 255) # returns FFFFFF rgb(255, 255, 300) # returns FFFFFF rgb(0,0,0) # returns 000000 rgb(148, 0, 211) # returns 9400D3 ``````

## Test cases

 ``````1 2 3 4 5 `````` ``````test.assert_equals(rgb(0,0,0),"000000", "testing zero values") test.assert_equals(rgb(1,2,3),"010203", "testing near zero values") test.assert_equals(rgb(255,255,255), "FFFFFF", "testing max values") test.assert_equals(rgb(254,253,252), "FEFDFC", "testing near max values") test.assert_equals(rgb(-20,275,125), "00FF7D", "testing out of range values") ``````

## The solution using Python

 `````` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 `````` ``````def rgb(r, g, b): # helper function def help(c): if c<0: return 0 if c>255: return 255 return c # make sure that values are within bounds r = help(r) g = help(g) b = help(b) # convert to hex # maintain 2 spaces each val = "%02x%02x%02x" % (r, g, b) # return UpperCase string return val.upper() ``````