Implement set operation

[corona10]

These operations should be implemented

>>> a = {1, 2, 3}
>>> b = {2, 3, 4, 5}
>>> a | b
{1, 2, 3, 4, 5}
>>> a & b
{2, 3}
>>> a - b
{1}
>>> a ^ b
{1, 4, 5}
>>>

[corona10]

These operations can be implemented on here based on below code.

https://github.com/go-python/gpython/blob/master/py/set.go#L65

func (s *Set) M__and__(other Object) (Object, error) {
        // TODO: Implement
       return ret, nil
}

[DoDaek]

I want to implement this issue

[corona10]

@DoDaek
I 'd like to recommend implementing M__and__ first.

[ncw]

I wrote the set primitives for gotemplate here: https://github.com/ncw/gotemplate/blob/master/set/set.go

These were based off the python primitives so should work with very little modification other than changing the types.

Feel free to use those here :-)

[SanggiHong]

Hi Team,

I found another operation to implement.

# python 3.7.4
>>> a = set([1,2,3])
>>> for ai in a:
...   print(ai)
...
1
2
3

# gpython
>>> a = set([1,2,3])
panic: interface conversion: py.Object is *py.List, not py.Tuple

goroutine 1 [running]:
github.com/go-python/gpython/py.SetNew(0xc0000ed290, 0xc00013ead0, 0x1, 0x3, 0x0, 0x14bc828, 0x0, 0x0, 0x42152e0)
	/Users/sanggihong/go/src/github.com/go-python/gpython/py/set.go:63 +0x20d
github.com/go-python/gpython/py.(*Type).M__call__(0xc0000ed290, 0xc00013ead0, 0x1, 0x3, 0x0, 0xc000115301, 0x104491e, 0xc0000f0ec0, 0xc00009db70)
	/Users/sanggihong/go/src/github.com/go-python/gpython/py/type.go:380 +0x82
github.com/go-python/gpython/py.Call(0x12f9f40, 0xc0000ed290, 0xc00013ead0, 0x1, 0x3, 0x0, 0x1279040, 0x1, 0xc0002a1e40, 0xc000115448)
	/Users/sanggihong/go/src/github.com/go-python/gpython/py/internal.go:169 +0x299
github.com/go-python/gpython/vm.callInternal(0x12f9f40, 0xc0000ed290, 0xc00013ead0, 0x1, 0x3, 0x0, 0xc0000cc370, 0xc0000f4e40, 0x0, 0x0, ...)
	/Users/sanggihong/go/src/github.com/go-python/gpython/vm/eval.go:1606 +0xcf
github.com/go-python/gpython/vm.(*Vm).Call(0xc00010c930, 0x1, 0x0, 0x0, 0x0, 0x0, 0xc0000f0ee0, 0xc00013eac0)
	/Users/sanggihong/go/src/github.com/go-python/gpython/vm/eval.go:1689 +0xf44
github.com/go-python/gpython/vm.do_CALL_FUNCTION(0xc00010c930, 0xc000000001, 0x0, 0x0)
	/Users/sanggihong/go/src/github.com/go-python/gpython/vm/eval.go:1428 +0x40
github.com/go-python/gpython/vm.RunFrame(0xc0000cc370, 0x0, 0xc000115a20, 0xc00013eac0, 0x0)
	/Users/sanggihong/go/src/github.com/go-python/gpython/vm/eval.go:1785 +0x338
github.com/go-python/gpython/vm.EvalCodeEx(0xc0000e4200, 0xc000140000, 0xc000140000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, ...)
	/Users/sanggihong/go/src/github.com/go-python/gpython/vm/eval.go:2162 +0x1014
github.com/go-python/gpython/vm.Run(...)
	/Users/sanggihong/go/src/github.com/go-python/gpython/vm/eval.go:2182
github.com/go-python/gpython/repl.(*REPL).Run(0xc000146000, 0xc0002ad580, 0x10)
	/Users/sanggihong/go/src/github.com/go-python/gpython/repl/repl.go:99 +0x397
github.com/go-python/gpython/repl/cli.RunREPL()
	/Users/sanggihong/go/src/github.com/go-python/gpython/repl/cli/cli.go:147 +0x295
main.main()
	/Users/sanggihong/go/src/github.com/go-python/gpython/main.go:73 +0xf51

Would it be better to make a new issue?

[skx]

Looks like this bug is can be closed; the appropriate pull-requests linked here were merged :)