#named indexes:txt1 = "My name is {fname}, I'm {age}".format(fname = "Bill", age = 63)#numbered indexes:txt2 = "My name is {0}, I'm {1}".format("Bill",63)#empty placeholders:txt3 = "My name is {}, I'm {}".format("Bill",63)print(txt1)print(txt2)print(txt3)