WEBVTT 00:00.080 --> 00:01.040 Welcome back. 00:01.080 --> 00:02.720 We finished the operators. 00:02.760 --> 00:05.960 Now let's move to printing and string basics. 00:06.120 --> 00:10.760 We use print function to display output. 00:10.920 --> 00:15.040 You can combine string using the plus sign. 00:15.320 --> 00:18.040 This is called concatenation. 00:18.080 --> 00:26.440 For example we have this variable called first name and its value is Bob last name and its value Smith. 00:26.480 --> 00:30.400 We have a variable called full name. 00:30.440 --> 00:40.400 This full name is a combination and concatenation of the first name plus a space plus the last name. 00:40.440 --> 00:44.880 Let me print hello and the full name. 00:45.120 --> 00:47.320 Run this cell and here we go. 00:47.640 --> 00:53.280 We have hello comma space and the full name. 00:53.400 --> 00:55.560 The full name is this variable. 00:55.760 --> 01:02.400 This variable is a concatenation between the first name string and the last name string. 01:02.600 --> 01:03.080 Okay. 01:03.120 --> 01:10.880 So did you did you understand this concatenation string strings in Python are surrounded by either single 01:10.880 --> 01:14.040 quotation mark or double quotation mark. 01:14.200 --> 01:16.880 So I can write like this. 01:16.880 --> 01:21.600 Smith in in single quotation or in double quotation. 01:21.640 --> 01:22.160 Okay. 01:22.320 --> 01:26.720 You can display a string literal with a print function. 01:26.720 --> 01:31.360 So we use this print function to display the string literals. 01:31.400 --> 01:37.200 Also we can get the length of the string using the Len function. 01:37.400 --> 01:43.440 So here let me try to use print length of the full name. 01:43.480 --> 01:45.480 Run the cell again we have. 01:45.480 --> 01:48.520 This error can only concatenate string, not integer. 01:48.520 --> 01:51.800 So I remove this and run again. 01:51.800 --> 01:52.720 And here we go. 01:53.040 --> 01:57.480 We have nine characters in the full name. 01:57.520 --> 02:00.760 In the next videos we're going to talk about the functions. 02:00.760 --> 02:03.560 But don't worry, we'll clarify everything. 02:03.680 --> 02:10.320 Also, we can use f strings formatted strings for easier formatting. 02:10.560 --> 02:14.240 For example, age equals to 30. 02:14.280 --> 02:20.280 Instead of writing every time the plus and the concatenation. 02:20.280 --> 02:23.840 In this way we can use this way. 02:24.160 --> 02:27.160 So print f the formatted. 02:27.160 --> 02:30.350 My name is full name. 02:30.350 --> 02:36.590 We include the variable in between those parentheses and I am age. 02:36.590 --> 02:44.110 You can notice that that the age is another variable included between those parentheses. 02:44.110 --> 02:50.230 And by the way there is a different color from the normal string. 02:50.230 --> 02:51.950 So this is the normal string. 02:52.070 --> 02:56.710 And this is the literal that it will be printed at it. 02:56.710 --> 03:01.590 But the variable will be printed according to its value. 03:01.630 --> 03:04.070 Let me run again and here we go. 03:04.350 --> 03:06.910 My name is Bob Smith. 03:07.110 --> 03:15.070 Full name variable is replaced by the concatenated variable used before and I am. 03:15.110 --> 03:22.430 Here we replace the age with the value of the age variable years old okay. 03:22.710 --> 03:30.270 So this is the formatted strings and this is the concatenation and the strings in Python. 03:30.510 --> 03:33.190 Or there are a lot of things about strings. 03:33.190 --> 03:40.270 But we are interested in things that are useful for our course machine learning.