sum(iterable) where iterable is a list comp doesn’t need [] or ()… /u/scarynut Python Education

Is there a smart reason why both these are allowed

sum(x for x in range(5)) sum([x for x in range(5)]) 

but only the last of these are?

l = x for x in range(5) l = [x for x in range(5)] 

In the case of builtins working on iterables, it seems you can omit the [] or () (always? sometimes?). That’s great, but does it not break some rule of consistency?

Is there a smart reason why both these are allowed

sum(x for x in range(5)) sum([x for x in range(5)]) 

but only the last of these are?

l = x for x in range(5) l = [x for x in range(5)] 

In the case of builtins working on iterables, it seems you can omit the [] or () (always? sometimes?). That’s great, but does it not break some rule of consistency?