Changing individual text colour in Label Expression using Python in ArcGIS

I’m basic at Python and I would like to change a single value colour to red, in this case the 6.36 value.

I’m using this code:

[Nazwa] + "/" + [PPW]  + "/" + [DPW]

So I wanted to change the colour of [DPW] to red. I was also thinking about using string, due to summing up the values before, don’t know why.

str( [Nazwa] ) + "/" + str( [PPW] )  + "/" + str ( [DPW] )

[STATE_NAME] +  " "  + "<CLR red='255'>" + [POP2000]  + "</CLR>"