Why functions with argument give 'none' in output

Question

https://code.sololearn.com/cNFWj5XjG2B0/?ref=app

Answer 1

cause it doesn't return anything, you have to add a return statement

Answer 2

I got it thanks

Answer 3

instead of print ('sum=', x+y)
we can write return ('sum=', x+y)

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