I don't understand this result

[snippsat]

just to mention that there is no need to explicitly convert the result to list

Python 3 has changed a lot buran 

# Python 3.6
>>> def az(x):
...     return x*2
... 
>>> q = map(az, [2, 3, 4])
>>> q
<map object at 0x049C8EB0>
>>> list(q)
[4, 6, 8]

# Python 2.7
>>> def az(x):
...     return x * 2
...     
>>> q = map(az, [2, 3, 4])
>>> q
[4, 6, 8]

Built-ins like range, map, zip, filter become iterables in 3.x to conserve space,
rather than producing a result list all at once in memory.