Answer 1

Generators generate objects, lists hold references to objects. They are very different things

If you don't call the objects of a generator, all you'll get is a generator object:

l = (i for i in range(10))
print(l) # <generator object <genexpr> at 0x...>

# call objects

for item in l:
print(l) # 0, 1, 2, ...

You can wrap the generator object in a list(). This forces python to actually generate the objects (instead of merely creating a generator object) and put them in a list:

print(list(l)) # [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]