check_if_triangle.py

a = int(input("Side a = "))
b = int(input("Side b = "))
c = int(input("Side c = "))

sides = []
sides.append(a)
sides.append(b)
sides.append(c)
sides.sort()

if sides[0] + sides[1] < sides[2]:
    print("Triangle not possible")
else:
    if a != b and b != c and a != c:
        print("All sides different")
    elif a == b and b == c:
        print("All sides equal")
    else:
        print("Two sides equal")