1# dict constructor
2
3d = dict()
4print(d)
5
6d = dict({1:2})
7print(d)
8
9d = dict(a=1)
10print(d)
11
12d = dict({1:2}, a=3)
13print(d[1], d['a'])
14
15d = dict([(1, 2)], a=3, b=4)
16print(d[1], d['a'], d['b'])
17