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Is it allowed to have an answer which has some code outside of a function? For example, in Python, if you were to get the sum of two square roots, would this be allowed:

import math
R=math.sqrt
def f(x,y):
 return R(x)+R(y)

or would it have to be this:

def f(x,y):
 import math
 R=math.sqrt
 return R(x)+R(y)

or maybe this:

import math
def f(x,y):
 R=math.sqrt
 return R(x)+R(y)
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