def proc(x): return 2*x*x def main(): x = 10 proc(x) print(x) print(proc(x))

Question

Why is this code showing "no output"???

Answer 1

Because you aren't calling the main function by doing,

main()

Answer 2

https://code.sololearn.com/cBwgp1qetHQH/?ref=app
https://code.sololearn.com/cTHRZ8i0Hk8z/?ref=app

Abhay is right , you have declared a function, but not called it!