I am proposing to add smth like JS destructing assignment to python.
Basically, it will allow unpacking any mapping (should have __getitem__ and
keys() methods) into variables.
Proposed syntax:
```
m = {"a": 1, "b": 2, "c": 3, "d": 4}
{a, b} = m # a: 1, b: 2
{a, b, **rest} = m # a: 1, b: 2, rest: {c: 3, d: 4}
```
It will be rawly equal to:
```
m = {"a": 1, "b": 2, "c": 3, "d": 4}
# {a, b} = m
a = m["a"]
b = m["b"]
# {a, b, **rest}
rest = {**m}
a = rest.pop("a")
b = rest.pop("b")
```
This is fully backward compatible feature because currently syntax like above
is not supported:
```
{a, b} = m # a: 1, b: 2
^^^^^^
SyntaxError: cannot assign to set display here. Maybe you meant '==' instead of
'='?
```
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