How to write simple "if elif else" conditional in Python

[Mostafa_El_Ayoubi]

layer = IN[0]
styles=[]
for i in layer:
	if i == "red" :
		styles.append("0.13mm")
	elif i == "yellow":
		styles.append ("0.18mm")
	else :
		styles.append ("0.13mm")

OUT = styles