Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00,000 --> 00:00:04,110 Hello there and welcome to this new lecture! In this lecture I'll show you 3 00:00:04,110 --> 00:00:09,240 how to set up Python in your computer. Specifically these instructions are for 5 00:00:09,240 --> 00:00:15,210 Windows users so if you are a Mac or Linux user you can skip this lecture 7 00:00:15,210 --> 00:00:18,300 and you can go to the next lecture where I'll show you how to set up Python on a 9 00:00:18,300 --> 00:00:24,420 Mac and instructions also work for Linux users so Windows users please follow if 11 00:00:24,420 --> 00:00:29,490 you haven't installed Python yet, we're going to download and install python and 13 00:00:29,490 --> 00:00:36,630 also try Python out. And so you go to python.org that's the official Python 15 00:00:36,630 --> 00:00:41,760 website and you go to downloads and here you'll see the latest Python version. 17 00:00:41,760 --> 00:00:51,600 Currently it is 3.6.0. Just click that and save file. 19 00:00:51,600 --> 00:00:57,750 Also notice that there's also a version of Python 2 so Python 2.7 to be exact 21 00:00:57,750 --> 00:01:05,369 but Python 2 is not being supported anymore after 2020 so Python 2 is slowly 23 00:01:05,369 --> 00:01:12,780 retiring so it's advisable to use Python 3 this one in here and once you have 25 00:01:12,780 --> 00:01:22,080 downloaded the dot exe file just click it. Run. You can choose to install it in the 27 00:01:22,080 --> 00:01:27,509 default directory but you can also do a customized installation if you want to 29 00:01:27,509 --> 00:01:32,700 change the directory, anyway make sure you have checked this option at Python 31 00:01:32,700 --> 00:01:40,320 3.6 to PATH so I'm going to go with the default installation process. Yeah that 33 00:01:40,320 --> 00:01:45,329 was it. Set up was successful. You can close the window now and we can go ahead 35 00:01:45,329 --> 00:01:52,079 and open Pythom so how do we do that on windows? Well we can press the 37 00:01:52,079 --> 00:01:58,590 Windows key button, so we're talking about the Win key. By pressing it you 39 00:01:58,590 --> 00:02:03,990 will be able to search on the start button, alternatively you can simply go 41 00:02:03,990 --> 00:02:10,289 to the start button, click it and then type cmd and then click on c armed.exe 43 00:02:10,289 --> 00:02:15,470 and that will open the windows command prompt. And so this is like the terminal 45 00:02:15,470 --> 00:02:21,110 on Mac or Linux. On Mac and Linux it is referred to as the terminal on 47 00:02:21,110 --> 00:02:26,510 Windows it is referred to as a comand prompt or command line. To open Python all 49 00:02:26,510 --> 00:02:32,930 you have to do is type in Python and that will open an interactive session of 51 00:02:32,930 --> 00:02:39,650 Python and an interactive session is best for testing out so here you can 53 00:02:39,650 --> 00:02:46,970 write lines of code one by one like that and you promptly get the results in here. 55 00:02:46,970 --> 00:02:53,900 So this is why we call it interactive, but you cannot, it's not very appropriate to 57 00:02:53,900 --> 00:02:59,150 write multiple lines of code, so let's say you have a program that has 10 lines 59 00:02:59,150 --> 00:03:05,269 of code and in that case you'd want to write those lines in a file, in a Python 61 00:03:05,269 --> 00:03:09,290 file but we will cover that later and this is the interactive shell this is 63 00:03:09,290 --> 00:03:14,030 good for testing, so before you do a program you are not sure about certain 65 00:03:14,030 --> 00:03:18,829 aspects, certain commands that you want to include, certain keywords that 67 00:03:18,829 --> 00:03:23,239 you want including in your program so you test things out in here very quickly. 69 00:03:23,239 --> 00:03:28,220 This is very efficient and it's also good for learning. To exit the 71 00:03:28,220 --> 00:03:36,290 interactive shell you press exit and brackets, open and closing brackets. 73 00:03:36,290 --> 00:03:43,220 Now something you maybe, you probably noted was that the Python that I opened was version 75 00:03:43,220 --> 00:03:51,709 3.5.2 but why is that because I installed Python 3.6 in here, 3.6, so why did 77 00:03:51,709 --> 00:03:55,010 I get five Python 3.5.2? Well the answer is that I already had 79 00:03:55,010 --> 00:04:01,310 Python 3.5.2 installed on my Windows so in other words 81 00:04:01,310 --> 00:04:09,919 before I install Python 3.6 I could trigger a Python shell like that so the 83 00:04:09,919 --> 00:04:15,260 question is how do I run Python 3.6 now? Well the first thing you should know is 85 00:04:15,260 --> 00:04:20,690 that there is no problem having multiple Python installations in your system, the 87 00:04:20,690 --> 00:04:25,880 key here is that you have to assign different commands to each of your 89 00:04:25,880 --> 00:04:28,430 Python instalations so for instance Python 3.5.2 91 00:04:28,430 --> 00:04:32,540 has these commands to run Python. Now for Python 3.6 93 00:04:32,540 --> 00:04:39,770 we need to assign another command and I'll go and search for the 95 00:04:39,770 --> 00:04:48,800 installation directory of Python 3.6 so open that and now Windows 97 00:04:48,800 --> 00:04:54,470 when you search for Python, when you enter the Python command here, Windows is 99 00:04:54,470 --> 00:04:59,450 looking at the path variable, the Windows path variable and it's searching for 101 00:04:59,450 --> 00:05:05,510 this type of command Python but this was already occupied by another so by 103 00:05:05,510 --> 00:05:09,530 Python 3.5.2, that's why it triggers Python 3.5.2, 105 00:05:09,530 --> 00:05:15,980 so in that case you may want to do trick here, let's say do Python 36 and 107 00:05:15,980 --> 00:05:28,070 restart that command prompt and then run again python 36 and you get Python 36. 109 00:05:28,070 --> 00:05:37,340 So that's the trick and again of course you can do operations here and so on 111 00:05:37,340 --> 00:05:43,760 Of course you still have Python 3.5 at least I have Python 3.5 maybe you don't 113 00:05:43,760 --> 00:05:49,430 because you didn't have any Python installed just yet, so that's the idea. 115 00:05:49,430 --> 00:05:53,720 On your system if you install Python for the first time, if you install 117 00:05:53,720 --> 00:05:58,220 Python 3.6 you'll be able to execute Python with this commands. 119 00:05:58,220 --> 00:06:03,980 Python. If you had an existing Python installation and you install a new one, 121 00:06:03,980 --> 00:06:12,230 no problem, you can run Python 36 like I did I hope this was clear and I hope you are 123 00:06:12,230 --> 00:06:18,460 up and running now with Python And I'll talk to you in the next lectures. 7380