sides = ([]) 
i = 0 
while i < 3: 
 side = float(input("Enter the length of one side: ")) 
 sides.append(side) 
 i += 1 
if sides.count(sides[0]) == 3: 
 print("Your triangle is an equilateral triangle.") 
else: 
 print("Your triangle is not an equilateral triangle.")
I hope this helps!