I can not understand what is wrong in my code

Question

https://code.sololearn.com/cC96z48ljvcl/?ref=app

it says syntax error but I can't understand what is it even....

Answer 1

You can't compare type and values like that, and you did lots of other simple mistake
here is a correction :

speed = 299792458
squared = speed * speed

print("Tell us the mass in SI unit:")
mass = input()

def energy(mass):
global squared
try:
mass = float(mass)
print("Energy is " + str(mass * squared) + " Joules.")
except:
print("We wanted a number only")

energy(mass) #input is a function, not the input you saved in mass

You should be able to find what you did wrong if you compare both codes :)