Python/C3/Getting-started-with-tuples/English-timed - Revision history

PoojaMoolya at 07:04, 27 March 2017

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PoojaMoolya at 11:10, 20 February 2017

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Gaurav at 10:25, 3 September 2014

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Sneha at 09:50, 26 March 2013

2013-03-26T09:50:11Z

Minal: Created page with '{| border=1 !Timing !Narration |- | 0:00 | Hello friends and welcome to the tutorial on "getting started with tuples". |- | 0:05 | At the end of the tutorial, you will be able t…'

2013-01-02T12:09:40Z

Created page with '{| border=1 !Timing !Narration |- | 0:00 | Hello friends and welcome to the tutorial on "getting started with tuples". |- | 0:05 | At the end of the tutorial, you will be able t…'

New page

{| border=1
!Timing
!Narration
|-
| 0:00
| Hello friends and welcome to the tutorial on "getting started with tuples".

|-
| 0:05
| At the end of the tutorial, you will be able to,

# Understand of what tuples are.
# Compare them with lists.
# Know why they are needed and where to use them.

|-
| 0:15
| Before beginning this tutorial,we would suggest you to complete the tutorial on "Getting started with lists".

|-
| 0:21
| Let us start our ipython interpreter.

|-
|0:23
|Type ipython and hit Enter.

|-
|0:27
| Let's get started by defining a tuple.

|-
|0:29
|A tuple is defined by enclosing parentheses around a sequence of items separated by commas.

|-
|0:39
|It is similar to defining a list except that parentheses are used instead of square brackets.

|-
|0:45
|So type t is equal to within brackets 1, 2.5, "hello",-4, "world", 1.24,5.

|-
| 1:02
| The items in the tuple are indexed using numbers and can be accessed by using their position.

|-
|1:10
| For example,

|-
|1:11
|First you must type t

|-
|1:18
|Then t within square brackets 3.

|-
| 1:24
| It prints -4 which is the fourth item of the tuple.

|-
| 1:29
| Similarly type t within square brackets 1 colon 5 colon 2 and hit Enter.

|-
|1:40
|It prints the corresponding slice.

|-
|1:42
|This behaviour is similar to that of lists.

|-
|1:46
| But the difference can be seen when we try to change an element in the tuple.

|-
|1:51
|So type t within square brackets 2 is equal to within double quotes Hello, H is capital.

|-
| 2:05
| We can see that, it raises an error saying 'tuple object does not support item assignment'.

|-
|2:10
|Tuples are immutable, and hence cannot be changed after creation.

|-
|2:13
|Then, what is the use of tuples?

|-
|2:16
| We shall understand that soon.

|-
|2:19
| But let us look at a simple problem of swapping values.

|-
|2:24
|Pause the video here, try out the following exercise and resume the video.

|-
|2:30
| Given, a is equal to 5 and b is equal to 7.

|-
| 2:33
| Swap the values of a and b.

|-
| 2:38
| Switch to terminal of solution

|-
|2:40
|Type a is equal to 5, then b is equal to 7 , then type a and then b, you can see the values.

|-
| 2:50
| We now create a variable say, temp and swap the values using this variable.

|-
|2:56
|So type temp is equal to a.Then a is equal to b ;then type b is equal to temp.

|-
|3:08
|Then type a.

|-
|3:10
|Then b.

|-
| 3:13
| This is the traditional approach

|-
|3:16
| So let us do it the python way.

|-
|3:21
|So type a; then b; then a comma b is equal to b comma a.

|-
|3:33
|then a ; then b gives the output.

|-
| 3:38
| We see that the values are swapped.

|-
|3:43
| This idiom works for different data-types also.

|-
|3:46
|So lets type a is equal to 2 point 5; then b within double quotes hello where h is small letter.

|-
|3:59
|Then a comma b is equal to b comma a.

|-
|4:09
|Then a; then b.

|-
| 4:13
| Moreover this type of behaviour is something that feels natural and you'd expect to happen.

|-
|4:19
|This is possible because of the immutability of tuples.

|-
|4:22
|This process is called tuple packing and unpacking.

|-
|4:26
|So type 5 comma and hit Enter.

|-
|4:37
|What we see in the tuple is 1 element.

|-
|4:41
|So type 5 comma within double quotes hello where h is small letter comma 2.5.

|-
|4:57
|Now, It is a tuple with 3 elements.

|-
|5:03
|So when we are actually typing 2 or more elements separated by comma the elements are packed into a tuple.

|-
|5:10
|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.

|-
|5:21
| Immutability of tuples ensure that values are not changed during the packing and unpacking.

|-
| 5:29
| So This brings us to the end of this tutorial.

|-
|5:33
|In this tutorial, we have learnt to,

|-
|5:35
|1. Define tuples.

|-
|5:36
|2. Understand the similarities of tuples with lists, like indexing and iterability.

|-
|5:44
|3. Know about the immutability of tuples.

|-
|5:48
|4. Swap values, the python way.

|-
|5:52
|5. Understand the concept of packing and unpacking tuples.

|-
| 5:57
| Here are some self assessment questions for you to solve.

|-
|6:01
|1. Define a tuple containing two values.

|-
|6:04
|The first being integer 4 and second is a float 2.5

|-
|6:08
|2. If <tt>a = 5,</tt> then what is the type of a ?

|-
|6:13
|The options are int , float, tuple, string.

|-
|6:19
|The final question the third one is if <tt>a = (2, 3)</tt>

|-
|6:25
| What does <tt><nowiki>a[0], a[1] = (3, 4)</nowiki></tt> produce.

|-
| 6:34
| And the answers,

|-
|6:38
|1. A tuple is defined by enclosing parentheses around a sequence of items separated by commas.

|-
|6:44
|Hence, we write our tuple as,within brackets 4 comma 2.5.

|-
|6:53
|2. Since the given data is 5 followed by a comma, it means that it is a tuple

|-
|7:01
|3. <nowiki>The operation a within square brackets 0, a within square brackets 1 is equal to within brackets 3 comma 4 will result in an error because tuples are immutable.</nowiki>

|-
| 7:14
| Hope you have enjoyed this tutorial and found it useful.

|-
|7:17
|Thank you!

|}

@@ Line 48: / Line 48: @@
 |-
 |01:10
-| For example,
+| For example,First you must type t
-−
-|-
-|01:11
-|First you must type t
 |-
@@ Line 224: / Line 220: @@
 |-
 |05:35
-|Define tuples.
+|Define tuples.Understand the similarities of tuples with lists, like indexing and iterability.
-−
-|-
-|05:36
-|Understand the similarities of tuples with lists, like indexing and iterability.
 |-

@@ Line 10: / Line 10: @@
 | 00:05
 | At the end of the tutorial, you will be able to,
 Understand of what tuples are.
-# Understand of what tuples are.
+Compare them with lists.
-# Compare them with lists.
+Know why they are needed and where to use them.
-# Know why they are needed and where to use them.
 |-
@@ Line 225: / Line 224: @@
 |-
 |05:35
-|1. Define tuples.
+|Define tuples.
 |-
 |05:36
-|2. Understand the similarities of tuples with lists, like indexing and iterability.
+|Understand the similarities of tuples with lists, like indexing and iterability.
 |-
 |05:44
-|3. Know about the immutability of tuples.
+| Know about the immutability of tuples.
 |-
 |05:48
-|4. Swap values, the python way.
+|Swap values, the python way.
 |-
 |05:52
-|5. Understand the concept of packing and unpacking tuples.
+|Understand the concept of packing and unpacking tuples.
 |-
@@ Line 249: / Line 248: @@
 |-
 |06:01
-|1. Define a tuple containing two values.
+|Define a tuple containing two values.
 |-
@@ Line 257: / Line 256: @@
 |-
 |06:08
-|2. If a = 5,  then what is the type of a ?
+|If a = 5,  then what is the type of a ?
 |-
@@ Line 277: / Line 276: @@
 |-
 |06:38
-|1. 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.
 |-
@@ Line 285: / Line 284: @@
 |-
 |06:53
-|2. Since the given data is 5 followed by a comma, it means that it is a tuple
+|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.
+|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.
 |-

@@ Line 80: / Line 80: @@
 |-
-|001:51
+|01:51
 |So type t within square brackets 2 is equal to in double quotes Hello, H is capital.

@@ Line 290: / Line 290: @@
 |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.
 |-

@@ Line 56: / Line 56: @@
 |-
 |1:18
-|Then t within square brackets 3.
+|Then type  t within square brackets 3.
 |-
@@ Line 80: / Line 80: @@
 |-
 |1:51
-|So type t within square brackets 2 is equal to within double quotes Hello, H is capital.
+|So type t within square brackets 2 is equal to in double quotes Hello, H is capital.
 |-
@@ Line 116: / Line 116: @@
 |-
 | 2:38
-| Switch to terminal of solution
+| Switch to terminal  for solution
 |-
@@ Line 152: / Line 152: @@
 |-
 |3:33
-|then a ; then b gives the output.
+|then a ; then b  to see the output.
 |-
@@ Line 176: / Line 176: @@
 |-
 | 4:13
-| Moreover this type of behaviour 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.
 |-
@@ Line 188: / Line 188: @@
 |-
 |4:26
-|So type 5 comma and hit Enter.
+|So type 5 comma to see what is tuple packing
-−
 |-
 |4:37
@@ Line 220: / Line 219: @@
 |-
 |5:33
-|In this tutorial, we have learnt to,
+|In this tutorial, we have learn't to,
 |-
@@ Line 256: / Line 255: @@
 |-
 |6:08
-|2. If <tt>a = 5,</tt> then what is the type of a ?
+|2. If a = 5,  then what is the type of a ?
 |-
@@ Line 264: / Line 263: @@
 |-
 |6:19
-|The final question the third one is if <tt>a = (2, 3)</tt>
+|The final question the third one is if  a = (2, 3)
 |-
 |6:25
-| What does <tt><nowiki>a[0], a[1] = (3, 4)</nowiki></tt> produce.
+| What does  a[0], a[1] = (3, 4)  produce.
 |-
@@ Line 288: / Line 287: @@
 |-
 |7:01
-|3. <nowiki>The operation a within square brackets 0, a within square brackets 1 is equal to within brackets 3 comma 4 will result in an error because tuples are immutable.</nowiki>
+|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.