AssertionError: All sides are equal

Hi! well, this is my solution to the problem, but for some reason when I run it I get "AssertionError: All sides are equal". my problem is that the code working in pycharm and jupyter notebook, so I don't have a slight clue where is the problem. thanks for the help

def checkio(a,b,c):
lf=[]
try:
    if (a * a + b * b - c * c)==0:
        lf.append(int(round(math.degrees(math.asin((a*1.0)/c)))))
        lf.append(int(round(math.degrees(math.asin((b*1.0)/c)))))
        lf.append(90)
        return sorted(lf)
    else:
        lf.append(int(round(math.degrees(math.acos((a * a + b * b - c * c)/(2.0 * a * b))))))
        lf.append(int(round(math.degrees(math.acos((a * a + b * b - c * c)/(2.0 * a * c))))))
        lf.append(int(round(math.degrees(math.acos((a * a + b * b - c * c)/(2.0 * c * b))))))
    return sorted(lf)
except:
    return [0,0,0]