Let's talk about the most important thing in programming... BOOOOOOOLEAN ALGEBRA. Hmm... Is that a True statement OR False? Watch the video AND find out... Or NOT... Up to you. In case you missed it, here are the previous parts of the series: Python for Beginners, Part 1: How to Download and Install Python Python for Beginners, Part 2: Hello World Exercise Python for Beginners, Part 3: The Turtle Module Python for Beginners, Part 4: Interactive Shell vs. Script Python for Beginners, Part 5: Variables Python for Beginners, Part 6: Strings Python for Beginners, Part 7: Fun Fun Functions Python for Beginners, Part 8: Function Arguments Python for Beginners, Part 9: Loops Python for Beginners, Part 10: Primitive Data Python for Beginners, Part 11: String Slicing Python for Beginners, Part 12: List of Things Python for Beginners, Part 13: Append List-Method Python for Beginners, Part 14: E-1 Circle of Squares Python for Beginners, Part 15: Solution Circle of Squares Python for Beginners, Part 16 - Dictionaries Transcript 0:00 hey guys what's up this is Qazi this is 0:03 my third time making this video last two 0:05 recordings got deleted and they were 0:07 really long I'm gonna try to make it 0:09 short and sweet right it only lets me 0:11 make him better so that's what I'm 0:13 actually excited for anyways in this 0:16 video we're going to talk about Boolean 0:18 algebra jiujitsu. Okay before we get to 0:23 that I wanna just take a second to show 0:26 you guys check it up the official clever 0:31 programmer premium short sleeve t-shirt 0:36 custom designed, let me know what you 0:39 guys think and I'll put in the link for 0:42 you guys below so if you guys want to 0:44 actually get it you can order it um some 0:48 feedback would be great if you think it 0:50 sucks or if you think it's good let me 0:52 know I would love to know that let's get 0:56 on with what we are trying to cover for 0:58 today, okay so I want to talk about 1:04 Boolean algebra alright, so what is it 1:07 and how does it work and why do we need 1:10 to know it. It's one of the most 1:13 important things in programming that's a 1:18 period in all of computer programming 1:22 languages anything that you use even in 1:24 electricity it's super important at the 1:27 end of the day everything turns to zero 1:29 one or true or false 1:32 okay so we have false or true notice how 1:36 their special statements in Python which 1:38 is why they highlight into the color 1:40 orange and pipe and then it doesn't give 1:44 you an error Python like understands 1:46 what true and false is for example if 1:47 you do true like this or false like this 1:50 it's going to give you back an error 1:51 saying I have no idea what you're 1:53 talking about 1:54 so they're like pre-existing things that 1:57 are built into Python now why would we 2:01 need to ever use this right why would we 2:04 need to use this well let me show you 2:06 guys something that foreshadows a little 2:08 bit into maybe are one of our next few 2:10 videos like condition 2:11 the control flow where I'm going to talk 2:14 more about if statements but let me just 2:15 for shout out that and show you guys so 2:17 you guys can see from a bigger picture 2:19 perspective how it works and in turn 2:22 that would make you want to learn what 2:23 it is and then we can get down into the 2:26 nitty-gritty details, cool so for example 2:29 an if statement works like this you have 2:32 an if statement followed by some 2:35 condition which does not need to be in 2:38 parenthesis but I'm just putting in 2:39 parentheses and that condition evaluates 2:42 to a true or a false statement okay and 2:46 based on that right based on this then 2:52 this so it's like if that then this okay 3:00 so if Johnny made more if Johnny worked 3:03 overtime and he worked more than 40 3:05 hours then I want to pay him overtime 3:09 okay so for example the only time this 3:14 block of code runs is if Johnny made 3:16 more than 40 hours which means it needs 3:18 to value it to true you need to have a 3:20 true here okay so let's say if true 3:25 print hello okay and notice that this 3:32 block of code runs because this 3:35 statement is true and then this block of 3:38 code runs right this is the if condition 3:41 it's not very smart, what I'm doing here 3:43 is kind of stupid I'm just hard coding 3:45 true right in there which is not what 3:47 you're going to be doing most at times 3:48 but I'm just doing this to like 3:50 illustrate how it breaks in it's a bare 3:52 bones skeleton so to speak and let me 3:55 show you if false and then see what 3:57 happens print hi and you can see that 4:01 this part of the code did not run 4:03 because it goes Oh false it's false so 4:06 I'm not going to run it not going to do 4:08 this right it falls and you know don't 4:10 pay him overtime or whatever right I 4:12 could have anything else here I just 4:14 have print hello but the implications of 4:17 this are far more than printing stuff 4:19 it's doing actual software right now 4:23 another reason why this is very 4:25 important for you guys to learn is 4:27 imagine if you were hired, you're working 4:29 in a company and you had to design a 4:31 system for paying employees well if you 4:32 do your logic wrong then you might be 4:35 paying every employee overtime which 4:38 means that the company is paying way 4:40 more money to its employees like for 4:44 example you might write the logic wrong 4:46 and employee that works three hours 4:49 might be getting paid overtime for all 4:50 of those - the hours the company has to 4:52 pay a lot more money and then the 4:54 company has to fire a lot of people 4:55 because they're like well there's a lot 4:58 of money going out of our pockets right 4:59 on the other hand you could have the 5:02 case where no employees getting paid 5:06 overtime even though they worked 5:08 overtime over 40 hours so with the great 5:12 power right as being a programmer comes 5:14 great responsibility so that's why you 5:15 want to learn this stuff really really 5:17 well so you don't make these MIT big 5:19 mistakes and you can help out companies 5:23 and you can help clients or whoever 5:25 right so we have this case false print 5:29 hi that's what happens but now let's do 5:31 something more interesting so I'm going 5:32 to introduce you guys is something 5:33 called comparison operators okay 5:38 so you guys might know the equal equal 5:40 sign it compares two things together not 5:42 one equal sign that makes something 5:44 something two equal signs check if one 5:47 thing is equal to another thing okay so 5:51 I have two equal signs I have less than 5:54 or less than I have a greater than sign 5:58 I have a less than or equal to sign have 6:00 a greater than or equal to sign a but 6:01 does not equal sign okay these are your 6:04 comparison operators so what do I mean 6:08 five is equal to five it's going to give 6:11 me back a true right five is five how 6:16 about if I said five does not equal five 6:18 what do you think is going to give me 6:19 false right that doesn't make any sense 6:21 how about five is greater than five does 6:24 that make sense no it's not five is less 6:26 than five nope five is less than or 6:28 equal to five it should give me back a 6:30 true five is greater than or equal to 6:32 five and it also gives me back a true 6:35 because it's not greater than but it is 6:37 certain 6:38 two-five okay so that's how this works 6:41 and look at the bottom it breaks down 6:43 into true-false true-false right now 6:47 let's say we wanted to pay Johnny more 6:49 if you worked going back to our original 6:50 example let's say we want to pick Johnny 6:52 more if you work extra hours right if 6:55 you work 40 hours or something so how 6:58 would we check that condition if you 7:01 work more than 40 hours how would we 7:02 check that we have to make that 7:04 condition we have to check that 7:05 condition so these are all called 7:07 conditions because at the end of the day 7:10 they evaluate to a true or false okay so 7:12 this is a condition and then evaluates 7:14 to false here so let's make a variable 7:17 called Johnny hours work and let's set 7:20 that equal to 40 and now let's check it 7:23 Johnny 7:24 hours work is greater than 40 so I'm 7:27 like asking my computer question and 7:29 it'll say false okay so I know I 7:32 shouldn't pay him overtime then write 7:34 because I got back a false what if I did 7:35 is he making is he doing more hours than 7:37 30 okay good so at least he's working 7:40 right he's not just not doing anything 7:43 okay so he's worth more than 30 hours 7:45 but he has not worked greater than 40 7:48 hours okay has he worked greater than or 7:53 equal to 40 hours mmm it says true since 7:57 I know he hasn't worked greater than 40 7:59 hours then in this statement greater 8:01 than or equal to 40 I know that he's 8:03 worked equal to 40 but let's just double 8:07 check and say equal equal 40 okay cool 8:11 so we now know that Johnny has worked 8:14 exactly 40 hours so we can't pay him 8:16 over time in this case but let's just 8:19 try it out anyways let's do if Johnny 8:21 let's turn it into like uh like a 8:24 conditional statement which again we're 8:26 going to get more into later is greater 8:29 than 40 right then friend pay him 8:34 overtime 8:35 Oh looks like we're not going to pay him 8:39 overtime because he has worked exactly 8:41 40 hours now let's make Johnny two hours 8:44 41 hours let's say he's worked 41 hours 8:48 right so overtime now let's run this and 8:50 you can see that it says pay 8:52 over time so how could this translate 8:55 for you Oh 8:57 first of all let's just break down 8:58 exactly what this turns into right so we 9:01 have this statement if Johnny were 9:04 greater than 40 hours how does this 9:05 actually work well what is the variable 9:08 Johnny hours work 9:09 we made it 41 right 41 is greater than 9:13 40 is that true it certainly is 9:15 41 is greater than 40 and we get true 9:18 and then we get into its most barebone 9:21 skeleton structure which I showed you 9:23 guys up at the top right here and it's 9:25 simple it's simply just a true at the 9:27 end of the day and then this block of 9:29 code runs okay and if the same way the 9:36 reason why this line of code for example 9:39 like let's say I do this right if you 9:41 were greater than 42 hours why does this 9:43 line of code not work well again Johnny 9:47 hoursworked is 41 is 41 more than 42 of 9:51 course not 9:52 so this turns to false and when this 9:54 turns to false we get back we actually 10:00 get back nothing because this line of 10:01 code does not run okay that's a bare 10:05 bone like that's the main reason why we 10:07 use Boolean operators there are lots of 10:10 other reasons that you'll see as well in 10:11 the next video we're gonna get down more 10:14 into how boolean logic works so for now 10:19 showed you guys comparison operators in 10:20 the next video we're going to talk about 10:22 Boolean logical operators okay so for 10:28 example we're going to talk about and 10:29 and we're going to talk about or and 10:32 we're going to talk about not all right 10:35 and how all of those things work in sync 10:38 with each other that's it for this video 10:41 I'll see you guys in the next video.

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