Prefer literals over list and dict functions

[lgeiger]

This is just some search and replace to improve readability:

• d = dict() --> d = {}
• l = list() --> l = []

Some nice benefit of this is that literals in Python are quite a bit faster (though only 60 ns - 75 ns):

In [1]: %timeit d = dict()
101 ns ± 0.0829 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)

In [2]: %timeit dl = {}
34.1 ns ± 0.378 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)

In [3]: %timeit l = list()
101 ns ± 0.541 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)

In [4]: %timeit l = []
25.4 ns ± 0.346 ns per loop (mean ± std. dev. of 7 runs, 10000000 loops each)

[afrozenator]

Thanks @lgeiger !