Method expect

source/python.js:1798–1807

(type, value)

                return false;
            }
            expect(type, value) {
                const token = this.peek();
                if (token.type !== type) {
                    throw new python.Error(`Unexpected '${token.value}' instead of '${type}' ${this.location()}`);
                }
                if (value && token.value !== value) {
                    throw new python.Error(`Unexpected '${token.value}' instead of '${value}' ${this.location()}`);
                }
                this.read();
            }
            location() {
                return `at ${this.filename}:${this.lineno}:${this.col_offset}.`;
            }