Invalid operands 'Dictionary' and 'Array' in operator '+'.Godot3.5 - godot

Question

I am using v3.5.stable.official [991bb6ac7] Godot Engine I was also using version 3.4, that is also the reason I have decided to update, since I can't get passed by that error.
Invalid operands 'Dictionary' and 'Array' in operator '+'
extends Area2D
onready var timer = $Timer
onready var plant = $Sprite
var stage = 0
var PlantNum
func _ready():
PlantNum = Game.Plot.size()
Game.Plot += [{
"Seed": "Corn",
"TimeLeft": timer.time_left,
"Stage": stage,
}]
Utils.save_game()
timer.start()
plant.frame = 1
This piece of code is for my game project that I am trying to make. The code serves for the save and load, so that the plants stage will stay the same as when I join again.
The global script which is connected to the upper one.
extends Node
var Plot = [
{
"Seed":"",
"TimeLeft":0,
"Stage":0,
},
]
Expected output
[{Seed:, Stage:0, TimeLeft:0}, {Seed:Corn ,Stage:0, TimeLeft:0}]
Any help would be much appreciated.

Answer 1

I don't know why you are getting that particular error. My first guess is that somewhere along the line the type was lost… Either somewhere you set a Dictionary to Plot (after all, it is Variant), or we are looking at a bug in Godot.
Either way, you can declare Plot as an Array (so it is not Variant). Either implicitly:
var Plot := [
{
"Seed":"",
"TimeLeft":0,
"Stage":0,
},
]
Or explicitly
var Plot:Array = [
{
"Seed":"",
"TimeLeft":0,
"Stage":0,
},
]
On the other hand, using using append_array is better than += (it does not allocate a new Array), so I would prefer that:
Game.Plot.apppend_array([{
"Seed": "Corn",
"TimeLeft": timer.time_left,
"Stage": stage,
}])
Furthermore, you are just adding one element, thus you can use append:
Game.Plot.apppend({
"Seed": "Corn",
"TimeLeft": timer.time_left,
"Stage": stage,
})

Answer 2

Thanks for the post.
I have done this
func _ready():
PlantNum = Game.Plot.size()
Game.Plot.append({
"Seed": "Corn",
"TimeLeft": timer.time_left,
"Stage": stage,
})
And this,
var Plot := [
{
"Seed":"",
"TimeLeft":0,
"Stage":0,
}]
I got a new error by doing so,
Parser Error: The assigned value's type (Dictionary) doesn't match the variable's type (Array).
func _ready():
var date = OS.get_datetime()
Game.Plot = OS.get_datetime() # Error is in this line.
self.text = "Time: " + str(date["hour"]) + " : " + str(date["minute"])