I am new to python. I have a few questions coming from an armature!

[Jussi Piitulainen]

Lawrence D’Oliveiro writes:

> On Tuesday, August 16, 2016 at 6:26:01 PM UTC+12, Paul Rudin wrote:
>> sohcahtoa82 writes:
>>> squared_plus_one_list = map(lambda x: x**2 + 1, some_list)
>> 
>> I realise that this is about understanding lambda, but it's worth noting
>> in passing that we tend to write this sort of thing as:
>> 
>> squared_plus_one_list = [x**2 + 1 for x in some_list]
>
> The difference being that the “map” function takes an iterable and
> returns an iterator.

They tend to write that sort of thing as:

squared_plus_one_thing = (x**2 + 1 for x in some_thing)

> Why could this difference be important?

Different comprehensions (pun!) and performance characteristics.