RGB To Hex Conversion

The rgb function is deficient. Completing it will result in a hexadecimal representation being returned when RGB decimal values are passed in. RGB decimal values range from 0 to 255. Any values outside of that range must be rounded to the nearest valid value.

255, 255, 255 --> "FFFFFF"
255, 255, 300 --> "FFFFFF"
0, 0, 0       --> "000000"
148, 0, 211   --> "9400D3"

Note: answer should be 6 characters long, the shorthand with 3 will not work here. Examples (input --> output):

def rgb(r, g, b):
    round = lambda x: min(255, max(x, 0))
    return ("{:02X}" * 3).format(round(r), round(g), round(b))

def limit(num):
    if num < 0:
        return 0
    if num > 255:
        return 255
    return num


def rgb(r, g, b):
    return "{:02X}{:02X}{:02X}".format(limit(r), limit(g), limit(b))

def rgb(r, g, b): 
    return ''.join(['%02X' % max(0, min(x, 255)) for x in [r, g, b]])

def rgb(*args):
	return ''.join(map(lambda x: '{:02X}'.format(min(max(0, x), 255)), args));

def rgb(r, g, b):
    return "{:02X}{:02X}{:02X}".format(clamp(r), clamp(g), clamp(b))
        
def clamp(x): 
    return max(0, min(x, 255))

def rgb(r, g, b):
    if r < 0:
        r = 0
    if g < 0:
        g = 0
    if b < 0:
        b = 0
    if r > 255:
        r = 255
    if g > 255:
        g = 255
    if b > 255:
        b = 255
    return '%02X%02X%02X' % (r,g,b)