In Python, how do you define an empty dictionary named sample_dict? sample dict ={} sample_dict = dict 0 All of the above None of the above Whariniwifintrd to the screen when the following code is executed? You assign new price =20 and the datatype of new_price is an integer. How can you change it to float without changing its value? price=price1.0 price = price /1.0 price = float(price) Alt of the above