Convert RGB to hex colors - Python

a) convert range 0 ...255 to 00 ...ff

'#{:02x}{:02x}{:02x}'.format( 120, 0 , 255 )
'#7800ff'

convert rgba (a=alpha) to hex

'#{:02x}{:02x}{:02x}{:02x}'.format( 120, 0 , 255, 128 )
'#7800ff80'

b) convert plot color range 0 ...1 to 00 ...ff

convert numbers between 0 and 1 into hex color code

import matplotlib

matplotlib.colors.to_hex([ 0.47, 0.0, 1.0 ])
u'#7800ff'

same, but with additional transparent (alpha) value '0.5'

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read more

https://pyformat.info/

http://webcolors.readthedocs.io/