Difference between revisions of "Python/C3/Getting-started-with-tuples/English-timed"
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| − | + | |'''Time''' | |
| − | + | |'''Narration''' | |
| + | |||
|- | |- | ||
| − | | | + | | 00:00 |
| Hello friends and welcome to the tutorial on "getting started with tuples". | | Hello friends and welcome to the tutorial on "getting started with tuples". | ||
|- | |- | ||
| − | | | + | | 00:05 |
| At the end of the tutorial, you will be able to, | | At the end of the tutorial, you will be able to, | ||
| Line 15: | Line 16: | ||
|- | |- | ||
| − | | | + | | 00:15 |
| Before beginning this tutorial,we would suggest you to complete the tutorial on "Getting started with lists". | | Before beginning this tutorial,we would suggest you to complete the tutorial on "Getting started with lists". | ||
|- | |- | ||
| − | | | + | | 00:21 |
| Let us start our ipython interpreter. | | Let us start our ipython interpreter. | ||
|- | |- | ||
| − | | | + | |00:23 |
|Type ipython and hit Enter. | |Type ipython and hit Enter. | ||
|- | |- | ||
| − | | | + | |00:27 |
| Let's get started by defining a tuple. | | Let's get started by defining a tuple. | ||
|- | |- | ||
| − | | | + | |00:29 |
|A tuple is defined by enclosing parentheses around a sequence of items separated by commas. | |A tuple is defined by enclosing parentheses around a sequence of items separated by commas. | ||
|- | |- | ||
| − | | | + | |00:39 |
|It is similar to defining a list except that parentheses are used instead of square brackets. | |It is similar to defining a list except that parentheses are used instead of square brackets. | ||
|- | |- | ||
| − | | | + | |00:45 |
|So type t is equal to within brackets 1, 2.5, "hello",-4, "world", 1.24,5. | |So type t is equal to within brackets 1, 2.5, "hello",-4, "world", 1.24,5. | ||
|- | |- | ||
| − | | | + | | 01:02 |
| The items in the tuple are indexed using numbers and can be accessed by using their position. | | The items in the tuple are indexed using numbers and can be accessed by using their position. | ||
|- | |- | ||
| − | | | + | |01:10 |
| For example, | | For example, | ||
|- | |- | ||
| − | | | + | |01:11 |
|First you must type t | |First you must type t | ||
|- | |- | ||
| − | | | + | |01:18 |
|Then type t within square brackets 3. | |Then type t within square brackets 3. | ||
|- | |- | ||
| − | | | + | | 01:24 |
| It prints -4 which is the fourth item of the tuple. | | It prints -4 which is the fourth item of the tuple. | ||
|- | |- | ||
| − | | | + | | 01:29 |
| Similarly type t within square brackets 1 colon 5 colon 2 and hit Enter. | | Similarly type t within square brackets 1 colon 5 colon 2 and hit Enter. | ||
|- | |- | ||
| − | | | + | |01:40 |
|It prints the corresponding slice. | |It prints the corresponding slice. | ||
|- | |- | ||
| − | | | + | |01:42 |
|This behaviour is similar to that of lists. | |This behaviour is similar to that of lists. | ||
|- | |- | ||
| − | | | + | |01:46 |
| But the difference can be seen when we try to change an element in the tuple. | | But the difference can be seen when we try to change an element in the tuple. | ||
|- | |- | ||
| − | | | + | |001:51 |
|So type t within square brackets 2 is equal to in double quotes Hello, H is capital. | |So type t within square brackets 2 is equal to in double quotes Hello, H is capital. | ||
|- | |- | ||
| − | | | + | | 02:05 |
| We can see that, it raises an error saying 'tuple object does not support item assignment'. | | We can see that, it raises an error saying 'tuple object does not support item assignment'. | ||
|- | |- | ||
| − | | | + | |02:10 |
|Tuples are immutable, and hence cannot be changed after creation. | |Tuples are immutable, and hence cannot be changed after creation. | ||
|- | |- | ||
| − | | | + | |02:13 |
|Then, what is the use of tuples? | |Then, what is the use of tuples? | ||
|- | |- | ||
| − | | | + | |02:16 |
| We shall understand that soon. | | We shall understand that soon. | ||
|- | |- | ||
| − | | | + | |02:19 |
| But let us look at a simple problem of swapping values. | | But let us look at a simple problem of swapping values. | ||
|- | |- | ||
| − | | | + | |02:24 |
|Pause the video here, try out the following exercise and resume the video. | |Pause the video here, try out the following exercise and resume the video. | ||
|- | |- | ||
| − | | | + | |02:30 |
| Given, a is equal to 5 and b is equal to 7. | | Given, a is equal to 5 and b is equal to 7. | ||
|- | |- | ||
| − | | | + | | 02:33 |
| Swap the values of a and b. | | Swap the values of a and b. | ||
|- | |- | ||
| − | | | + | | 02:38 |
| Switch to terminal for solution | | Switch to terminal for solution | ||
|- | |- | ||
| − | | | + | |02:40 |
|Type a is equal to 5, then b is equal to 7 , then type a and then b, you can see the values. | |Type a is equal to 5, then b is equal to 7 , then type a and then b, you can see the values. | ||
|- | |- | ||
| − | | | + | | 02:50 |
| We now create a variable say, temp and swap the values using this variable. | | We now create a variable say, temp and swap the values using this variable. | ||
|- | |- | ||
| − | | | + | |02:56 |
|So type temp is equal to a.Then a is equal to b ;then type b is equal to temp. | |So type temp is equal to a.Then a is equal to b ;then type b is equal to temp. | ||
|- | |- | ||
| − | | | + | |03:08 |
|Then type a. | |Then type a. | ||
|- | |- | ||
| − | | | + | |03:10 |
|Then b. | |Then b. | ||
|- | |- | ||
| − | | | + | | 03:13 |
| This is the traditional approach | | This is the traditional approach | ||
|- | |- | ||
| − | | | + | |03:16 |
| So let us do it the python way. | | So let us do it the python way. | ||
|- | |- | ||
| − | | | + | |03:21 |
|So type a; then b; then a comma b is equal to b comma a. | |So type a; then b; then a comma b is equal to b comma a. | ||
|- | |- | ||
| − | | | + | |03:33 |
|then a ; then b to see the output. | |then a ; then b to see the output. | ||
|- | |- | ||
| − | | | + | | 03:38 |
| We see that the values are swapped. | | We see that the values are swapped. | ||
|- | |- | ||
| − | | | + | |03:43 |
| This idiom works for different data-types also. | | This idiom works for different data-types also. | ||
|- | |- | ||
| − | | | + | |03:46 |
|So lets type a is equal to 2 point 5; then b within double quotes hello where h is small letter. | |So lets type a is equal to 2 point 5; then b within double quotes hello where h is small letter. | ||
|- | |- | ||
| − | | | + | |03:59 |
|Then a comma b is equal to b comma a. | |Then a comma b is equal to b comma a. | ||
|- | |- | ||
| − | | | + | |04:09 |
|Then a; then b. | |Then a; then b. | ||
|- | |- | ||
| − | | | + | | 04:13 |
| Moreover this type of behavior is something that feels natural and you'd expect to happen. | | Moreover this type of behavior is something that feels natural and you'd expect to happen. | ||
|- | |- | ||
| − | | | + | |04:19 |
|This is possible because of the immutability of tuples. | |This is possible because of the immutability of tuples. | ||
|- | |- | ||
| − | | | + | |04:22 |
|This process is called tuple packing and unpacking. | |This process is called tuple packing and unpacking. | ||
|- | |- | ||
| − | | | + | |04:26 |
|So type 5 comma to see what is tuple packing | |So type 5 comma to see what is tuple packing | ||
| + | |||
|- | |- | ||
| − | | | + | |04:37 |
|What we see in the tuple is 1 element. | |What we see in the tuple is 1 element. | ||
|- | |- | ||
| − | | | + | |04:41 |
|So type 5 comma within double quotes hello where h is small letter comma 2.5. | |So type 5 comma within double quotes hello where h is small letter comma 2.5. | ||
|- | |- | ||
| − | | | + | |04:57 |
|Now, It is a tuple with 3 elements. | |Now, It is a tuple with 3 elements. | ||
|- | |- | ||
| − | | | + | |05:03 |
|So when we are actually typing 2 or more elements separated by comma the elements are packed into a tuple. | |So when we are actually typing 2 or more elements separated by comma the elements are packed into a tuple. | ||
|- | |- | ||
| − | | | + | |05:10 |
|When we type a comma b is equal to b comma a first the value of b and a are packed into a tuple from the right side then unpack into the variables a and b. | |When we type a comma b is equal to b comma a first the value of b and a are packed into a tuple from the right side then unpack into the variables a and b. | ||
|- | |- | ||
| − | | | + | |05:21 |
| Immutability of tuples ensure that values are not changed during the packing and unpacking. | | Immutability of tuples ensure that values are not changed during the packing and unpacking. | ||
|- | |- | ||
| − | | | + | | 05:29 |
| So This brings us to the end of this tutorial. | | So This brings us to the end of this tutorial. | ||
|- | |- | ||
| − | | | + | |05:33 |
|In this tutorial, we have learn't to, | |In this tutorial, we have learn't to, | ||
|- | |- | ||
| − | | | + | |05:35 |
|1. Define tuples. | |1. Define tuples. | ||
|- | |- | ||
| − | | | + | |05:36 |
|2. Understand the similarities of tuples with lists, like indexing and iterability. | |2. Understand the similarities of tuples with lists, like indexing and iterability. | ||
|- | |- | ||
| − | | | + | |05:44 |
|3. Know about the immutability of tuples. | |3. Know about the immutability of tuples. | ||
|- | |- | ||
| − | | | + | |05:48 |
|4. Swap values, the python way. | |4. Swap values, the python way. | ||
|- | |- | ||
| − | | | + | |05:52 |
|5. Understand the concept of packing and unpacking tuples. | |5. Understand the concept of packing and unpacking tuples. | ||
|- | |- | ||
| − | | | + | | 05:57 |
| Here are some self assessment questions for you to solve. | | Here are some self assessment questions for you to solve. | ||
|- | |- | ||
| − | | | + | |06:01 |
|1. Define a tuple containing two values. | |1. Define a tuple containing two values. | ||
|- | |- | ||
| − | | | + | |06:04 |
|The first being integer 4 and second is a float 2.5 | |The first being integer 4 and second is a float 2.5 | ||
|- | |- | ||
| − | | | + | |06:08 |
|2. If a = 5, then what is the type of a ? | |2. If a = 5, then what is the type of a ? | ||
|- | |- | ||
| − | | | + | |06:13 |
|The options are int , float, tuple, string. | |The options are int , float, tuple, string. | ||
|- | |- | ||
| − | | | + | |06:19 |
|The final question the third one is if a = (2, 3) | |The final question the third one is if a = (2, 3) | ||
|- | |- | ||
| − | | | + | |06:25 |
| What does a[0], a[1] = (3, 4) produce. | | What does a[0], a[1] = (3, 4) produce. | ||
|- | |- | ||
| − | | | + | | 06:34 |
| And the answers, | | And the answers, | ||
|- | |- | ||
| − | | | + | |06:38 |
|1. A tuple is defined by enclosing parentheses around a sequence of items separated by commas. | |1. A tuple is defined by enclosing parentheses around a sequence of items separated by commas. | ||
|- | |- | ||
| − | | | + | |06:44 |
|Hence, we write our tuple as,within brackets 4 comma 2.5. | |Hence, we write our tuple as,within brackets 4 comma 2.5. | ||
|- | |- | ||
| − | | | + | |06:53 |
|2. Since the given data is 5 followed by a comma, it means that it is a tuple | |2. Since the given data is 5 followed by a comma, it means that it is a tuple | ||
|- | |- | ||
| − | | | + | |07:01 |
|3. The operation a in square brackets 0, a in square brackets 1 is equal to in brackets 3 comma 4 will result in an error because tuples are immutable. | |3. The operation a in square brackets 0, a in square brackets 1 is equal to in brackets 3 comma 4 will result in an error because tuples are immutable. | ||
|- | |- | ||
| − | | | + | | 07:14 |
| Hope you have enjoyed this tutorial and found it useful. | | Hope you have enjoyed this tutorial and found it useful. | ||
|- | |- | ||
| − | | | + | |07:17 |
|Thank you! | |Thank you! | ||
|} | |} | ||
Revision as of 15:32, 10 July 2014
| Time | Narration |
| 00:00 | Hello friends and welcome to the tutorial on "getting started with tuples". |
| 00:05 | At the end of the tutorial, you will be able to,
|
| 00:15 | Before beginning this tutorial,we would suggest you to complete the tutorial on "Getting started with lists". |
| 00:21 | Let us start our ipython interpreter. |
| 00:23 | Type ipython and hit Enter. |
| 00:27 | Let's get started by defining a tuple. |
| 00:29 | A tuple is defined by enclosing parentheses around a sequence of items separated by commas. |
| 00:39 | It is similar to defining a list except that parentheses are used instead of square brackets. |
| 00:45 | So type t is equal to within brackets 1, 2.5, "hello",-4, "world", 1.24,5. |
| 01:02 | The items in the tuple are indexed using numbers and can be accessed by using their position. |
| 01:10 | For example, |
| 01:11 | First you must type t |
| 01:18 | Then type t within square brackets 3. |
| 01:24 | It prints -4 which is the fourth item of the tuple. |
| 01:29 | Similarly type t within square brackets 1 colon 5 colon 2 and hit Enter. |
| 01:40 | It prints the corresponding slice. |
| 01:42 | This behaviour is similar to that of lists. |
| 01:46 | But the difference can be seen when we try to change an element in the tuple. |
| 001:51 | So type t within square brackets 2 is equal to in double quotes Hello, H is capital. |
| 02:05 | We can see that, it raises an error saying 'tuple object does not support item assignment'. |
| 02:10 | Tuples are immutable, and hence cannot be changed after creation. |
| 02:13 | Then, what is the use of tuples? |
| 02:16 | We shall understand that soon. |
| 02:19 | But let us look at a simple problem of swapping values. |
| 02:24 | Pause the video here, try out the following exercise and resume the video. |
| 02:30 | Given, a is equal to 5 and b is equal to 7. |
| 02:33 | Swap the values of a and b. |
| 02:38 | Switch to terminal for solution |
| 02:40 | Type a is equal to 5, then b is equal to 7 , then type a and then b, you can see the values. |
| 02:50 | We now create a variable say, temp and swap the values using this variable. |
| 02:56 | So type temp is equal to a.Then a is equal to b ;then type b is equal to temp. |
| 03:08 | Then type a. |
| 03:10 | Then b. |
| 03:13 | This is the traditional approach |
| 03:16 | So let us do it the python way. |
| 03:21 | So type a; then b; then a comma b is equal to b comma a. |
| 03:33 | then a ; then b to see the output. |
| 03:38 | We see that the values are swapped. |
| 03:43 | This idiom works for different data-types also. |
| 03:46 | So lets type a is equal to 2 point 5; then b within double quotes hello where h is small letter. |
| 03:59 | Then a comma b is equal to b comma a. |
| 04:09 | Then a; then b. |
| 04:13 | Moreover this type of behavior is something that feels natural and you'd expect to happen. |
| 04:19 | This is possible because of the immutability of tuples. |
| 04:22 | This process is called tuple packing and unpacking. |
| 04:26 | So type 5 comma to see what is tuple packing |
| 04:37 | What we see in the tuple is 1 element. |
| 04:41 | So type 5 comma within double quotes hello where h is small letter comma 2.5. |
| 04:57 | Now, It is a tuple with 3 elements. |
| 05:03 | So when we are actually typing 2 or more elements separated by comma the elements are packed into a tuple. |
| 05:10 | When we type a comma b is equal to b comma a first the value of b and a are packed into a tuple from the right side then unpack into the variables a and b. |
| 05:21 | Immutability of tuples ensure that values are not changed during the packing and unpacking. |
| 05:29 | So This brings us to the end of this tutorial. |
| 05:33 | In this tutorial, we have learn't to, |
| 05:35 | 1. Define tuples. |
| 05:36 | 2. Understand the similarities of tuples with lists, like indexing and iterability. |
| 05:44 | 3. Know about the immutability of tuples. |
| 05:48 | 4. Swap values, the python way. |
| 05:52 | 5. Understand the concept of packing and unpacking tuples. |
| 05:57 | Here are some self assessment questions for you to solve. |
| 06:01 | 1. Define a tuple containing two values. |
| 06:04 | The first being integer 4 and second is a float 2.5 |
| 06:08 | 2. If a = 5, then what is the type of a ? |
| 06:13 | The options are int , float, tuple, string. |
| 06:19 | The final question the third one is if a = (2, 3) |
| 06:25 | What does a[0], a[1] = (3, 4) produce. |
| 06:34 | And the answers, |
| 06:38 | 1. A tuple is defined by enclosing parentheses around a sequence of items separated by commas. |
| 06:44 | Hence, we write our tuple as,within brackets 4 comma 2.5. |
| 06:53 | 2. Since the given data is 5 followed by a comma, it means that it is a tuple |
| 07:01 | 3. The operation a in square brackets 0, a in square brackets 1 is equal to in brackets 3 comma 4 will result in an error because tuples are immutable.
|
| 07:14 | Hope you have enjoyed this tutorial and found it useful. |
| 07:17 | Thank you! |
