is_triangle

def is_triangle(a, b, c):
    sides = [a, b, c]
    for x, y, z in sides:
        if x + y < z:
            return False
        if abs(x - y) > z:
            return False
    for side in sides:
        if side <= 0:
            return False
    return True

print(is_triangle(7, 2, 2))