Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00,000 --> 00:00:04,859 Hey welcome to this new lecture and in this lecture I'm going to show you how 3 00:00:04,859 --> 00:00:12,059 to create and execute a Python program on a Mac computer, so if you are a 5 00:00:12,059 --> 00:00:17,520 Windows user please skip this lecture. And so in the previous lecture I showed 7 00:00:17,520 --> 00:00:25,080 you how to install Python 3 and also how to launch a Python 3 interactive 9 00:00:25,080 --> 00:00:33,809 Session, so which is good for executing and testing out code so like that line. 11 00:00:33,809 --> 00:00:43,410 Like my line, but if you quit the terminal you're going to lose that code, so you 13 00:00:43,410 --> 00:00:49,800 want to find out a way to save that code in a file so that you can develop your 15 00:00:49,800 --> 00:00:56,010 program step by step, so you can go back to your code, add the code, modify it, and 17 00:00:56,010 --> 00:01:01,379 most importantly you can execute multiple lines at once instead of 19 00:01:01,379 --> 00:01:06,659 executing line by line interactively. So let's go ahead and do that. 21 00:01:06,659 --> 00:01:11,700 Normally you need to figure out, to create a directory where you want to 23 00:01:11,700 --> 00:01:17,850 save your program, so I'm going to create this folder in here and this is empty 25 00:01:17,850 --> 00:01:25,590 for now, so I'm going to create a file there. There may be different ways 27 00:01:25,590 --> 00:01:32,189 of creating a Python file all but I prefer to do it via the terminal. 29 00:01:32,189 --> 00:01:37,560 So currently you do PWD, that will print out the current directory of the terminal, 31 00:01:37,560 --> 00:01:43,049 so the terminal is an app and it is opened in the current directory, in a certain 33 00:01:43,049 --> 00:01:50,399 directory which is this on for the moment. If you do ls you will see the 35 00:01:50,399 --> 00:01:56,939 directories and files or the current Directory, so users admin has this 37 00:01:56,939 --> 00:02:03,090 directors, has these folders so if you want to go to the desktop folder, 39 00:02:03,090 --> 00:02:08,080 you'd want to do desktop or you can use the Tab for auto 41 00:02:08,080 --> 00:02:16,360 Completion, so the tab key and then Un Tab. That will take you to the 43 00:02:16,360 --> 00:02:24,250 untitled folder. Execute and I'll see that your current folder is the untitled 45 00:02:24,250 --> 00:02:32,020 folder and that means you can go ahead and create a file now. Let's say touch my 47 00:02:32,020 --> 00:02:42,070 program dot py, so you can give it any name that you want. Execute and that 49 00:02:42,070 --> 00:02:49,420 will create an empty file which for now you can go ahead and edit it with text 51 00:02:49,420 --> 00:02:54,160 edit for example. Later on we're going to install Atom editor which is much 53 00:02:54,160 --> 00:02:59,709 more advanced than this simple editor but for now this should be enough to 55 00:02:59,709 --> 00:03:06,580 just get you started to get you the idea on how to execute a Python program 57 00:03:06,580 --> 00:03:12,340 so let create code for the program. This program will simply 59 00:03:12,340 --> 00:03:20,230 print out the hello text so you need, you use this print keyword and then you use 61 00:03:20,230 --> 00:03:28,600 double quotes and then the text hello and then another double quote to close the 63 00:03:28,600 --> 00:03:32,760 text and then a closing bracket. 65 00:03:46,470 --> 00:03:56,520 CTRL S to save, exit text edit and then go back to the terminal and what you do 67 00:03:56,520 --> 00:04:00,930 here now to execute your program, the program that you just created, you use the 69 00:04:00,930 --> 00:04:07,200 Python 3 command and then my, you can type my program dot py or you can use 71 00:04:07,200 --> 00:04:14,760 tab to autocomplete the name, enter to execute and you get the output of the program. 73 00:04:14,760 --> 00:04:20,040 Print it out in the terminal so in this case the output is hello and yeah that's how 75 00:04:20,040 --> 00:04:24,570 you create and execute a program on Mac and similarly you can go ahead and 77 00:04:24,570 --> 00:04:31,050 create other Python programs in here just as we did with my program dot py. I can also 79 00:04:31,050 --> 00:04:35,730 show you a quick way to actually open the terminal in this current directory 81 00:04:35,730 --> 00:04:42,690 without having to do CD and try the path name, so let's do that. 83 00:04:42,690 --> 00:04:50,460 You go here, system preferences, so this is a one time configuration. Go to keyboard. 85 00:04:50,460 --> 00:05:03,150 Shortcuts and then in the shortcuts tab you go to services, scroll down and see 87 00:05:03,150 --> 00:05:08,070 you probably have this option unchecked, so you want to make sure you 89 00:05:08,070 --> 00:05:13,590 have checked the new terminal at folder option just like I have it here, so make 91 00:05:13,590 --> 00:05:20,490 sure make sure that is checked. Close this and then what you do is to open the 93 00:05:20,490 --> 00:05:25,350 terminal in a current folder, in a specific folder you right click on 95 00:05:25,350 --> 00:05:34,110 folder and then go to New Terminal at Folder and now what you do is Python 3 97 00:05:34,110 --> 00:05:39,390 Myprogram.py, execute and you get the Output, so that's a quick way to open 99 00:05:39,390 --> 00:05:44,100 the terminal in a specific folder and yeah that's about this lecture. 101 00:05:44,100 --> 00:05:50,210 I hope everything went smoothly and I'll talk to you later. Thanks. 6084