Method constructor

source/python.js:19–31

(items)

        this._operators = new Map();
        const dict = class extends Map {
            constructor(items) {
                super();
                if (items) {
                    if (items instanceof Map) {
                        items = Array.from(items);
                    } else if (!Array.isArray(items)) {
                        items = Object.entries(items);
                    }
                    for (const [name, value] of items) {
                        this.__setitem__(name, value);
                    }
                }
            }
            __contains__(key) {
                return this.has(key);
            }