[issue21678] Add operation plus for dictionaries

[Михаил Мишакин]

New submission from Михаил Мишакин:

First of all, i'm sorry for my English :)

I would like to union dictionaries with operator + (and +=) like this:

 dict(a=1, b=2) + {'a': 10, 'c': 30}
{'a': 10, 'b': 2, 'c': 30}

 d = dict(a=1, b=2, c={'c1': 3, 'c2': 4})
 d += dict(a=10, c={'c1':30})
 d
{'a': 10, 'b': 2, c: {'c1':30}}


Also, it gives an easy way to modify and extend the class attributes:

class Super:
   params = {
   'name': 'John',
   'surname': 'Doe',
   }

class Sub(Super):
   params = Super.params + {
   'surname': 'Show',
   'age': 32,
   }

--
components: Interpreter Core
messages: 219867
nosy: Pix
priority: normal
severity: normal
status: open
title: Add operation plus for dictionaries
versions: Python 3.4

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[issue21678] Add operation plus for dictionaries

[Михаил Мишакин]

Михаил Мишакин added the comment:

Is's like list's operation + and it's method list.extend().
But dict have no operation +...

If I have two lists (A and B), and I want to get third list (not change A and 
B) i do this:
C = A + B

If I have two dicts, i can do this:
C = dict(A, **B)

But if i have three dictionaries, code becomes this:
C = dict(A, **dict(B, **D))

Don't you think, that + is more comfortable?
A = [1, 2, 3]
B = [4, 5]
C = [6, 7]
A + B + C = [1,2,3,4,5,6,7]

I can do this with list, tuples and strings. Why i can't do this with 
dictionaries?

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[issue21171] Outdated usage str.encode('rot-13') in rot13 codec

[Михаил Мишакин]

New submission from Михаил Мишакин:

Function rot13 in file encodings/rot_13.py throws exception:

LookupError: 'rot-13' is not a text encoding; use codecs.encode() to handle 
arbitrary codecs

--
messages: 215712
nosy: Pix
priority: normal
severity: normal
status: open
title: Outdated usage str.encode('rot-13') in rot13 codec
type: enhancement
versions: Python 3.4, Python 3.5

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[issue21171] Outdated usage str.encode('rot-13') in rot13 codec

[Михаил Мишакин]

Changes by Михаил Мишакин pixzi...@gmail.com:


--
components: +Library (Lib)

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