Is there any reason in writing dict() instead of {}?

Question

I've heard that construction {} works much faster then dict(). But does that mean I have to write {} everywhere ?

FWIW, `{}` is a literal so it can be created when the script is compiled to bytecode, whereas `dict()` calls the `dict` object constructor at runtime. Apart from efficiency considerations, it's generally considered better style to use a literal than an equivalent function / class call. — PM 2Ring, Dec 07 '16 at 12:40

score 0 · Answer 1 · answered Dec 07 '16 at 12:36

0

Just use {} and [] and forget about dict() and list()

answered Dec 07 '16 at 12:36

Andreas Rau

There are plenty good reasons to explicitely use `dict` and `list` (and `set`, `str` or any other builtin type having both a literal and normal syntax). – bruno desthuilliers Dec 07 '16 at 13:09
@brunodesthuilliers can you give me some examples ? – faoxis Dec 07 '16 at 13:11
@faoxis: building a dict from a list of key:value pairs, building a list from an iterable, etc... – bruno desthuilliers Dec 07 '16 at 13:20
dict = {el:0 for el in a} ... – Andreas Rau Dec 07 '16 at 13:27

1 Answers1