1 00:00:00,000 --> 00:00:03,990 There're basically two different kinds of numbers in Python. 2 00:00:04,000 --> 00:00:06,990 Let's go ahead and make a working copy of variables.py, 3 00:00:07,000 --> 00:00:14,990 and we'll look at them, variables-numbers.py. 4 00:00:15,000 --> 00:00:17,990 We'll open our working copy. 5 00:00:18,000 --> 00:00:22,990 And we'll go ahead and define a variable. 6 00:00:23,000 --> 00:00:25,990 And we'll give it a value. 7 00:00:26,000 --> 00:00:31,990 And then we'll print that variable and save and run. 8 00:00:32,000 --> 00:00:34,990 And you see we get that value. 9 00:00:35,000 --> 00:00:38,990 So what we have here is an integer type. 10 00:00:39,000 --> 00:00:47,990 So if I type num and I'll also have num, so we'll get both the type and the value, 11 00:00:48,000 --> 00:00:48,990 we'll go ahead and run that, 12 00:00:49,000 --> 00:00:52,990 and we see that its class is int, and its value is 42. 13 00:00:53,000 --> 00:00:59,990 If I say 42.0, now its type is going to be 42.0. 14 00:01:00,000 --> 00:01:03,990 So those are the two different kinds of numbers in Python. 15 00:01:04,000 --> 00:01:07,990 You have integers, and you have floating point numbers. 16 00:01:08,000 --> 00:01:14,990 If I take an integer like this, and I say 42/ 9, I'm no longer going to have an integer. 17 00:01:15,000 --> 00:01:20,990 If I save this and run it, we'll see that I have class 'float' and that it is this 18 00:01:21,000 --> 00:01:24,990 real number with a whole lot of digits after the decimal point. 19 00:01:25,000 --> 00:01:30,990 If I want to get an integer division, I can use two slashes instead of one. 20 00:01:31,000 --> 00:01:36,990 And now what I'll get, instead of 4.66666, I will get just 4. 21 00:01:37,000 --> 00:01:40,990 You'll notice that it is not rounded up. 22 00:01:41,000 --> 00:01:47,990 So if I want it to be rounded, I can type round and get back the floating point 23 00:01:48,000 --> 00:01:52,990 division and save that and run it, 24 00:01:53,000 --> 00:01:54,990 and now we have it rounded up. It's a 5. 25 00:01:55,000 --> 00:01:58,990 I can give another argument to round it to how many digits I want it to round to. 26 00:01:59,000 --> 00:02:00,990 I can save that and run it. 27 00:02:01,000 --> 00:02:03,990 And now we have 4.67. 28 00:02:04,000 --> 00:02:10,990 In addition to the integer division with the two slashes, remember it was like this - 29 00:02:11,000 --> 00:02:13,990 if I save that and run it, we get the 4 - 30 00:02:14,000 --> 00:02:21,990 I might also want the remainder, which is also called modulo, and that's with the % sign. 31 00:02:22,000 --> 00:02:28,990 So if I save that and run it, I have 6. That's the remainder after you do that 42/9. 32 00:02:29,000 --> 00:02:33,990 It's 4 with a remainder of 6. 33 00:02:34,000 --> 00:02:40,990 If I have a floating point number, say 42.9, but I want to make sure that 34 00:02:41,000 --> 00:02:46,990 it's actually going to be read as an integer, I can say int of, like this, and 35 00:02:47,000 --> 00:02:48,990 save that and run it, 36 00:02:49,000 --> 00:02:51,990 and I get just the 42 part. 37 00:02:52,000 --> 00:02:57,990 Likewise, if I have an integer number and I want the floating point 38 00:02:58,000 --> 00:03:03,990 representation of it, I can say float like that and save that and run it. 39 00:03:04,000 --> 00:03:08,990 And I actually get a floating point representation of the integer 42. 40 00:03:09,000 --> 00:03:12,990 Float and int are actually object constructors. 41 00:03:13,000 --> 00:03:15,990 These are constructors for those classes. 42 00:03:16,000 --> 00:03:19,990 So when I say float 42, what I'm actually doing is I'm creating an object of 43 00:03:20,000 --> 00:03:24,990 type float, and I'm giving it an initial value of 42. 44 00:03:25,000 --> 00:03:26,990 That's getting passed to the constructor. 45 00:03:27,000 --> 00:03:30,990 So those are the basic ways that you can use and create integers and floating 46 00:03:31,000 --> 00:03:41,000 point numbers in Python 3.