In [11]:
import time
In [19]:
def test():
    retval = []
    for i in range(5):
        retval.append(42)
        time.sleep(1)
    return retval
In [20]:
test
Out[20]:
<function __main__.test>
In [21]:
test()
Out[21]:
[42, 42, 42, 42, 42]
In [18]:
for x in test():
    print(x)
    break
42