$($read StanfordCSFunctions.pdf$)$

Compare these two functions $($saved as e$.$g$.$ hw$2.$py$)$:

def f$1($x$)$:

print x $+1$

def f$2($x$)$:

return x $+1$

$1\mathrm{.}1$ Run hw$2.$py in the shell. What happens when we call these functions?

$>>>$ f$1(3)$

$>>>$ f$2(3)$

It looks like they behave in exactly the same way. But they really don$$t$.$ Try this:

$>>>$ print $($f$1(3))$

$>>>$ f$2(3)$

Explain the difference.

$1\mathrm{.}2$ Finally, we can see the difference here:

$>>>$ f$1(3)+1$

$>>>$ f$2(3)+1$

Explain the difference.