Why no '|' operator for dict?

[Frank Millman]

Hi all

I recently learned that you can create a set 'on-the-fly' from two existing 
sets using the '|' operator -

Python 3.6.0 (v3.6.0:41df79263a11, Dec 23 2016, 08:06:12) [MSC v.1900 64 bit 
(AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>
>>> set_1 = set(('a', 'b', 'c'))
>>> set_2 = set(('d',))
>>> set_1 | set_2
{'d', 'a', 'c', 'b'}
>>>

I was hoping that I could do the same with a dictionary, but it does not 
work -

>>> dict_1 = {1: 'one', 2: 'two'}
>>> dict_2 = {3: 'three'}
>>> dict_1 | dict_2
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unsupported operand type(s) for |: 'dict' and 'dict'
>>>

The best that I can come up with is -

>>> dict([(k, v) for k, v in dict_1.items()] + [(k, v) for k, v in 
>>> dict_2.items()])
{1: 'one', 2: 'two', 3: 'three'}
>>>

So I have 2 questions -

1. Is there any particular reason why '|' is not supported?

2. Is there a better way to do what I want?

Thanks

Frank Millman