Question

Say I have the following class with a method returning a list:

class C:
    def f(self):
        return [1,2,3]

If I loop over the list returned fro the method, as follows:

c = C()
for i in c.f():
    print(i)

Inside the for loop, will c.f() be executed multiple times? If yes, in order to get it once, do I have to do assignment outside of the loop, or there is some trivial way?

Answer 1

In [395]: def tester():
     ...:     print "Tester Called!"
     ...:     return [1,2,3]

In [396]: for i in tester():
     ...:     pass
Tester Called!

Seems the answer is no.