Difference in printing tuples and list in python

Question

When I'm changing output type between list and tuple, one is showing output whereas other is just showing location of result. Why does this happen?

>>> symbol = '123456789'
>>> (s for s in symbol)
<generator object <genexpr> at 0x7fc0e9e2fbf8>
>>> [s for s in symbol]
['1', '2', '3', '4', '5', '6', '7', '8', '9']

@NedBatchelder And google'ing 'generator object' probably would have sufficed instead of making a post. — dfundako, Jul 07 '18 at 14:50
Possible duplicate of [Why is there no tuple comprehension in Python?](https://stackoverflow.com/questions/16940293/why-is-there-no-tuple-comprehension-in-python) — Brad Solomon, Jul 07 '18 at 14:50

score -1 · Answer 1 · answered Jul 07 '18 at 14:50

(s for s in symbol) is generator comprehension. Similar to:

symbol = '123456789'
def func():
    for s in symbol:
        yield s

g = func()
print(g)
<generator object func at 0x7ffff7e59410>

print(tuple(g)) 
('1', '2', '3', '4', '5', '6', '7', '8', '9')

If you supply the generator to list() or tuple(), the generator will run.

Difference in printing tuples and list in python

1 Answers1