1 00:00:00,330 --> 00:00:04,900 ‫Now let's move on to strings and python. 2 00:00:05,110 --> 00:00:14,190 ‫So how can we pass a string in a python if I just write as the python tutorial and executed 3 00:00:21,370 --> 00:00:31,480 ‫I'm getting an error because we need to pass strings and double quotes or single chords so we can write 4 00:00:32,410 --> 00:00:35,620 ‫double chords as deep Python tutorials 5 00:00:42,920 --> 00:00:43,500 ‫here. 6 00:00:43,540 --> 00:00:45,540 ‫We use double quotation marks. 7 00:00:45,580 --> 00:00:53,290 ‫You can also use single quotes to pass a string but sometimes your string may contain single quotes 8 00:00:53,370 --> 00:00:54,650 ‫in between. 9 00:00:54,670 --> 00:00:58,780 ‫So therefore it is recommended to use double quotes while passing the strings 10 00:01:01,610 --> 00:01:02,860 ‫just like numbers. 11 00:01:02,870 --> 00:01:12,080 ‫We can also assign this thing to some variable so we can write SB one here SDR one is over variable 12 00:01:12,320 --> 00:01:15,050 ‫and we are assigning value asleep by tend to Dodi Al 13 00:01:25,580 --> 00:01:31,790 ‫no my SDR 1 variable contains this value. 14 00:01:31,830 --> 00:01:40,770 ‫Now if we want to display the value of our SDR one variable I will just write SDR one and then execute 15 00:01:40,800 --> 00:01:42,270 ‫this Come on. 16 00:01:42,510 --> 00:01:50,430 ‫You can see we are getting our output and you can also notice that at speed by 10 tutorial is coming 17 00:01:50,430 --> 00:01:52,900 ‫in quotation marks. 18 00:01:53,010 --> 00:02:01,810 ‫There is also a separate print function and button to print the output to print output will write print 19 00:02:03,670 --> 00:02:06,850 ‫and in brackets will write SDR 1 20 00:02:10,690 --> 00:02:18,350 ‫you can now notice that there is no quotation marks and now the values are printed and they are not 21 00:02:18,350 --> 00:02:20,600 ‫a part of 0 4. 22 00:02:20,720 --> 00:02:26,540 ‫You can see when we just executed as earlier when we were getting the content of this variable in the 23 00:02:26,540 --> 00:02:27,710 ‫form of output. 24 00:02:27,770 --> 00:02:30,260 ‫You can see this output returning it. 25 00:02:30,530 --> 00:02:34,100 ‫But when we are printing it by then is actually printing it. 26 00:02:34,100 --> 00:02:35,720 ‫And this is not a part of our 27 00:02:38,950 --> 00:02:46,650 ‫Python even provides formatting options with this print function so suppose I wanted to use some variable 28 00:02:47,250 --> 00:02:56,250 ‫inside my brain come on I can do that by using green formatting for example and then what previous example 29 00:02:57,510 --> 00:03:05,350 ‫in the phrase as deep Python tutorial I wanted to pass variable X which will take value by 10 or are 30 00:03:05,500 --> 00:03:07,120 ‫depending the value 31 00:03:12,560 --> 00:03:20,870 ‫so if my axis python I wanted to print as true by standard Oriel if my X is odd I wanted to print as 32 00:03:20,870 --> 00:03:31,950 ‫the r tutorial or if X is a school I wanted to print as B and school tutorial so let's create this variable 33 00:03:31,980 --> 00:03:34,910 ‫X and assign it value add 34 00:03:38,060 --> 00:03:43,950 ‫notice that we are using double quotes to assign value to this variable 35 00:03:47,170 --> 00:03:48,580 ‫we will first rate print 36 00:03:52,230 --> 00:04:03,420 ‫and then records will put quotation marks and will pass the update string which is s.t. and then since 37 00:04:03,510 --> 00:04:13,120 ‫I won my second word too with this variable X I will I will give complete records and my third word 38 00:04:13,270 --> 00:04:15,180 ‫is upon strength which is tutorial. 39 00:04:15,520 --> 00:04:20,820 ‫So I will write tutorial. 40 00:04:21,580 --> 00:04:25,880 ‫Now I want to tell python what goes inside this go live record. 41 00:04:26,290 --> 00:04:36,490 ‫So after this print come on I will put a dot and write format and in parenthesis I can write my variable 42 00:04:36,490 --> 00:04:38,770 ‫name which is X 43 00:04:42,530 --> 00:04:51,750 ‫let's run this we are getting this edit because dot format should be inside the print come on. 44 00:04:51,750 --> 00:04:54,290 ‫So we just copy paste it 45 00:05:00,620 --> 00:05:01,030 ‫yeah. 46 00:05:01,150 --> 00:05:11,240 ‫And now if we execute it you can see we are getting as the odd tutorial if I change my value of x to 47 00:05:11,880 --> 00:05:13,650 ‫skew it. 48 00:05:14,700 --> 00:05:25,780 ‫And then again then this spring come on you can see no sense of what X is askew in the output is segment 49 00:05:25,790 --> 00:05:29,130 ‫based SD is squarely custodian. 50 00:05:29,410 --> 00:05:35,770 ‫So what's happening here is the live record in print come on titles Python to take the value of variable 51 00:05:35,950 --> 00:05:45,300 ‫that is mentioned in the dot format parenthesis if I want I can also pass toward more than two variables. 52 00:05:45,300 --> 00:05:48,110 ‫This index will remain the same in that case. 53 00:05:49,200 --> 00:05:55,260 ‫And you have to mention the variable names and not form it in the order you want them to be filled in 54 00:05:55,260 --> 00:05:56,120 ‫the college record. 55 00:05:57,700 --> 00:05:59,620 ‫So if we just write print 56 00:06:03,310 --> 00:06:06,160 ‫and index it we'll write s.t. 57 00:06:10,630 --> 00:06:16,800 ‫then college records yet our variable X will come then after this tutorial 58 00:06:20,140 --> 00:06:21,600 ‫and then another can leave record 59 00:06:25,940 --> 00:06:36,770 ‫and in dot we can write X and the variable we created earlier that was very when if we executed this 60 00:06:38,630 --> 00:06:47,430 ‫you can see what where one variable was containing 14 so what printed string it a city school tutorial 61 00:06:47,430 --> 00:06:54,550 ‫for being now let's discuss some important functions related to strings. 62 00:06:54,570 --> 00:06:58,250 ‫The first function is land function. 63 00:06:58,250 --> 00:07:04,300 ‫It helps us to find the length of our string the syntax of Len. 64 00:07:04,440 --> 00:07:06,010 ‫Function as a. 65 00:07:06,140 --> 00:07:16,070 ‫And now if we want to check the length of our we one variable we can just mention SDR one inside parenthesis 66 00:07:16,130 --> 00:07:18,150 ‫after length. 67 00:07:18,510 --> 00:07:28,270 ‫You can see the length of our variable as are one is 18 also known that is spaces also character so 68 00:07:28,270 --> 00:07:40,280 ‫this length 18 is count of all the characters including spaces and the penetration marks as well another 69 00:07:40,290 --> 00:07:46,260 ‫string function which we frequently used is replaced function. 70 00:07:46,350 --> 00:07:53,700 ‫You must have used replace function involved or not bank where you search the word and then replace 71 00:07:53,700 --> 00:07:58,710 ‫that word with a new word replace function and by Python bucks. 72 00:07:58,710 --> 00:08:00,840 ‫Exactly the same. 73 00:08:00,950 --> 00:08:02,360 ‫You have to give two words 74 00:08:04,960 --> 00:08:06,910 ‫first the word you want to search. 75 00:08:06,970 --> 00:08:09,940 ‫And second the vote you want to replace it with. 76 00:08:11,430 --> 00:08:14,700 ‫So let's again print over SDR one variable 77 00:08:18,150 --> 00:08:19,170 ‫right now. 78 00:08:19,170 --> 00:08:29,970 ‫My SDR 1 contains a steep Python tutorial if I want to replace this word python with as school I will 79 00:08:29,970 --> 00:08:45,580 ‫write SB 1 not replace and then record for the word I want to replace that is Python. 80 00:08:45,690 --> 00:08:48,250 ‫Also remember that Python is case sensitive. 81 00:08:48,260 --> 00:08:56,710 ‫Language so I have to pass python in lowercase since my variable contains python and lowercase i want 82 00:08:56,710 --> 00:08:59,470 ‫to replace this variable with a script. 83 00:09:00,550 --> 00:09:03,670 ‫So after a comma I will write a script. 84 00:09:09,870 --> 00:09:20,130 ‫You can see that the word by 10 has now been replaced with a school I can also save this value in another 85 00:09:20,130 --> 00:09:20,570 ‫variable. 86 00:09:21,540 --> 00:09:25,080 ‫So let's see if this value in another variable called X 87 00:09:30,600 --> 00:09:33,750 ‫I will copy paste so function 88 00:09:41,090 --> 00:09:42,060 ‫if I bring Dex 89 00:09:45,410 --> 00:09:47,530 ‫and you get this value as the school. 90 00:09:47,550 --> 00:09:50,380 ‫Claudia. 91 00:09:50,540 --> 00:09:56,330 ‫Now let's move on to a string indexes and string slicing. 92 00:09:56,350 --> 00:10:01,120 ‫You can see a string is a collection of several individual characters. 93 00:10:01,120 --> 00:10:11,820 ‫For example in our variable X as is a single character B is a single character and our whole string 94 00:10:11,940 --> 00:10:15,540 ‫is a collection of such characters. 95 00:10:15,620 --> 00:10:20,240 ‫This characters are present at a specified position they know what a string. 96 00:10:20,240 --> 00:10:29,300 ‫So for example as is present at the first politician B is present at the second position. 97 00:10:29,510 --> 00:10:32,930 ‫And similarly we have a space and the third position 98 00:10:36,030 --> 00:10:42,840 ‫we can extract this individual characters from our variable by specifying their positions. 99 00:10:42,840 --> 00:10:50,700 ‫This concept of extracting characters by their position is known this string indexing of all is String 100 00:10:50,760 --> 00:10:52,680 ‫slicing. 101 00:10:53,040 --> 00:10:58,920 ‫One thing to note here is that in Python indexing starts with zero 102 00:11:02,180 --> 00:11:13,130 ‫so a word character as is presented 0 to index B is present at first index and space is presented to 103 00:11:13,190 --> 00:11:21,600 ‫index so if I want to extract the character which is present at the first index I will just straight 104 00:11:21,600 --> 00:11:25,950 ‫up what a variable name which is x and then a squared record. 105 00:11:25,950 --> 00:11:27,960 ‫I will mention the index which is 1 106 00:11:32,970 --> 00:11:43,870 ‫if we execute this we will get B as I would output since B was present at the first index position is 107 00:11:43,870 --> 00:11:51,180 ‫different from index the position of B is two but since the index starts from 0 0 it as was presented 108 00:11:51,180 --> 00:11:54,670 ‫C both index and nobody was present at first index 109 00:11:57,520 --> 00:12:00,050 ‫I can also mention multiple index. 110 00:12:00,220 --> 00:12:09,760 ‫So if I want all the characters which are present from index to the index 5 I will write X and then 111 00:12:09,760 --> 00:12:19,960 ‫a squared record I will write to and then I will provide the colon symbol and then I will write 5. 112 00:12:20,030 --> 00:12:29,530 ‫This means that I want all characters which are present between index 2 and 5 notice that our first 113 00:12:29,530 --> 00:12:35,570 ‫character is a space where the second character is as another third character is skewed. 114 00:12:37,830 --> 00:12:47,400 ‫We are getting all the characters that are present at index 2 index 3 and index for we are not getting 115 00:12:48,060 --> 00:12:57,090 ‫our index 5 variable because the second argument is always excluded while slicing the string using indexes 116 00:12:58,550 --> 00:12:59,530 ‫so too. 117 00:12:59,530 --> 00:13:05,410 ‫Column 5 means character presented index 2 3 and 4 118 00:13:08,840 --> 00:13:18,230 ‫similarly if we write X bracket for colon 6 it will return the characters which are present at index 119 00:13:18,230 --> 00:13:30,440 ‫4 and 5 index 6 will be excluded from all the selection indexes also supports negative argument negative 120 00:13:30,630 --> 00:13:39,110 ‫it for counting from the backside of this string so minus 1 will be the last character of string minus 121 00:13:39,110 --> 00:13:42,200 ‫2 will be the second last character and so on. 122 00:13:44,150 --> 00:13:50,920 ‫So if I wanted to print last character off my string I will write X and end in a square record. 123 00:13:51,020 --> 00:13:53,270 ‫I will mention minus 1 124 00:13:58,130 --> 00:14:04,650 ‫we are getting L as our output since the last character it all forward very well. 125 00:14:04,660 --> 00:14:06,030 ‫X was an 126 00:14:10,150 --> 00:14:11,250 ‫while slicing. 127 00:14:11,260 --> 00:14:25,030 ‫You can also skip the arguments so if I write X and squared record I will write colon 5. 128 00:14:25,110 --> 00:14:31,410 ‫This means that I want all the characters from the start off my string line next 5. 129 00:14:31,440 --> 00:14:32,220 ‫If I add on this 130 00:14:36,110 --> 00:14:40,470 ‫you can see we are getting all the characters from the start of this string. 131 00:14:40,490 --> 00:14:49,880 ‫Similarly if I want all the characters from index 5 to the end of the string I would write X and record. 132 00:14:49,880 --> 00:14:51,410 ‫I would like five colon 133 00:14:54,820 --> 00:15:00,000 ‫can see all the characters from the fifth index is present in our output 134 00:15:03,190 --> 00:15:05,740 ‫now votive if I wanted done it. 135 00:15:05,740 --> 00:15:13,830 ‫Characters from my string I can do that by mentioning the third parameter which is the step that I make. 136 00:15:14,520 --> 00:15:17,620 ‫So earlier we were passing on the two parameters. 137 00:15:17,880 --> 00:15:25,820 ‫The starting point and then after the colon we were passing the end point we can also pass the Turk 138 00:15:25,850 --> 00:15:29,600 ‫argument after another colon symbol as a step argument. 139 00:15:31,250 --> 00:15:37,670 ‫So if I write X and then squared record I will write to colon then 140 00:15:41,280 --> 00:15:49,950 ‫this means I want all the characters from index to index 9 remember index expense is excluded. 141 00:15:52,490 --> 00:16:04,400 ‫But if I write to colon 10 colon 2 this means I want characters with a step as 2 so I will be getting 142 00:16:04,490 --> 00:16:11,310 ‫characters presented indexed to and since our step is still pretty radically jumped to index for 143 00:16:14,290 --> 00:16:26,910 ‫and then to index 6 and then to index it fight on this if I bring my X just to compare our output. 144 00:16:27,440 --> 00:16:35,020 ‫You can see our character at index 2 was space 145 00:16:38,580 --> 00:16:53,110 ‫character at index for was Q then character at index 6 was again in space and then character at index 146 00:16:53,230 --> 00:16:54,460 ‫it was you 147 00:16:57,820 --> 00:17:04,140 ‫similarly if you want to take this step size 2 3 4 or anything you can do that 148 00:17:08,010 --> 00:17:16,580 ‫1 think you may have noticed is that we are not defining variables while creating the variables as with 149 00:17:16,580 --> 00:17:23,510 ‫the other programming languages such as C askew L or C++ we don't have to define variable types and 150 00:17:23,510 --> 00:17:33,270 ‫by 10 by 10 will automatically assign the type depending on the value present in that variable so if 151 00:17:33,270 --> 00:17:42,090 ‫you are passing variable X as one by 10 will automatically assign X as an integer if you are passing 152 00:17:42,390 --> 00:17:52,550 ‫X as on a string it will automatically assign X as a string or if passing it as a decimal point it will 153 00:17:52,550 --> 00:18:01,100 ‫get a floating point type to know the type of variable we can use type function we just have to write 154 00:18:01,100 --> 00:18:09,470 ‫type and in parentheses write the variable name but here we will write X and we should get a string 155 00:18:09,590 --> 00:18:21,120 ‫as our output you can see the type of of what variable x is SBA similarly figured the type of forward 156 00:18:21,410 --> 00:18:22,820 ‫variable that is 157 00:18:25,690 --> 00:18:26,530 ‫variable 1 158 00:18:29,310 --> 00:18:34,830 ‫we are getting and since our variable 1 was containing 14 as a value 159 00:18:38,810 --> 00:18:47,690 ‫now if we assign variable to a value of five divided by two and we print this really way too you can 160 00:18:47,690 --> 00:18:56,950 ‫see that variable 2 is taking a value 2.5 if we want to get the tape of this variable 2 we will write 161 00:18:56,960 --> 00:19:05,720 ‫type and then record will write variable 2 we should be adding floating number as decimal is spelt in 162 00:19:05,720 --> 00:19:06,320 ‫our value.