Vyper: Can't assign to a whole struct with `=`, need to use `:`

[jamesray1]

I have not been able to assign a value to every member of a struct in this way:

    # Doesn't work: 
    # self.collator_registry[self.collator_address] = {
    #    deregistered = 0,
    #    pool_index = self.pool_index_temp,
#}

[ben-kaufman]

I think it doesn't work since it's not the correct syntax. The right syntax is:

self.collator_registry[self.collator_address] = {
        deregistered: 0,
       pool_index: self.pool_index_temp,
}

You should use : instead of the =

[jamesray1]

But isn't : used for variable declarations, not assignments? Struct syntax.

[ben-kaufman]

Not in struct assignments like so (apparently), thinking about that it might be worth changing for better convention but for now you should use : for that.

[jamesray1]

Yes, it would be better to use =. If it's going to be changed I'll just leave it commented out for now, and do individual assignments in the mean time.

self.collator_registry[self.collator_address].deregistered = 0 
    self.collator_registry[self.collator_address].pool_index \
= self.pool_index_temp

[jamesray1]

It seems like a colon (:) doesn't work either.

I still get the same error:

invalid syntax (, line 214).

Where line 214 is deregistered in:

    self.collator_registry[self.collator_address] = {
        deregistered = 0,
        pool_index = self.pool_index_temp,
    }

[jacqueswww]

I am pretty sure this works. I was just playing with below example and all is well. Why are you using dict struct with assign operator inside?

testmap: {
    a: int128,
    b: int128
}[int128]

@public
def __init__(a: int128, b: int128):
    self.testmap[1] = {
        a: a,
        b: b
    }


@public
def test123() -> (int128, int128):
    self.testmap[1] = {
        a: 123,
        b: 456
    }

    return self.testmap[1].a, self.testmap[1].b


@public
def get() -> (int128, int128):
    return self.testmap[1].a, self.testmap[1].b

[jamesray1]

OK, so I had to use the colon (declaration operator) instead of the equals sign (the assignment operator) inside the struct. That seems odd. I want to assign the value 0 to deregistered, and the value self.pool_index_temp to pool_index. I already declared these members in the struct in the preamble.

[jamesray1]

Ah I realize that inside the struct you are using the key: value syntax.

[fubuloubu]

Yup. Python doesn't accept assigns in dicts like that. It would accept the following however: MyStruct(key1=call, key2=val2, ...). Worth considering as the struct assignment syntax.

[fubuloubu]

The above would require typedef syntax for structs however

[daniel-jozsef]

I believe this isn't in scope for Vyper discussions - Python does it this way, we do it this way. The syntax is semantically correct btw, you're not doing assignments, you're doing a declaration.

You're declaring a new struct, and assigning it to a variable.

[jacqueswww]

Closing, as I believe the original issue was resolved.