Pratik kamble: Created page with "{| border = 1 | '''Time''' | '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on '''Input and Output'''. |- | 00:06 |In this tutorial, we will learn to '''Prin..."

2019-06-04T09:15:39Z

Created page with "{| border = 1 | '''Time''' | '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on '''Input and Output'''. |- | 00:06 |In this tutorial, we will learn to '''Prin..."

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{| border = 1
| '''Time'''
| '''Narration'''

|-
| 00:01
| Welcome to the spoken tutorial on '''Input and Output'''.

|-
| 00:06
|In this tutorial, we will learn to

'''Print''' some values

'''Print''' using '''format specifiers'''

|-
|00:14
|Take '''input''' from user and

Display a '''prompt''' to the user before taking the '''input'''

|-
|00:22
|To record this tutorial, I am using

'''Ubuntu Linux 16.04''' operating system

'''Python 3.4.3 '''and

'''IPython 5.1.0'''

|-
| 00:38
| To practise this tutorial, You should know how to run basic '''Python '''commands on the '''ipython console.'''

|-
| 00:47
|If not, see the relevant '''Python '''tutorials on this website.

|-
| 00:52
| Let us start '''ipython'''.

|-
| 00:55
|Open the '''terminal.'''

Type '''ipython3 '''and press '''Enter.'''

|-
| 01:03
|From here onwards, remember to press the '''Enter''' key after typing every command on the '''terminal'''.

|-
| 01:10
| Let us start this tutorial with a '''string.'''

|-
| 01:14
|Type, '''a '''''is equal to inside double quotes''''' This is a string'''

|-
| 01:21
| To see the value of '''a''', type, '''a'''

|-
| 01:26
| Type, '''print''' ''inside parentheses'' '''a'''

|-
| 01:31
|This also prints the value of '''a'''. But there is a difference in the outputs. Typing just''' a '''displays the content of '''a. '''

|-
| 01:43
|The '''statement print''' ''inside parentheses'' '''a''' prints the '''string''' itself. We can see the difference clearly when we use '''strings''' with new lines in them.

|-
| 01:55
| Type '''b '''''is equal to inside double quotes''''' A line backslash n New line'''

|-
| 02:04
| Type, '''b''' As you can see, it just shows that '''b''' contains a '''newline character'''.

|-
| 02:13
| Type, '''print '''''inside parentheses '''''b'''

|-
| 02:18
|It prints the '''string, A line''' and then '''New line''' in the next line. '''print statement''' in '''Python''' supports '''string formatting'''.

|-
| 02:28
| Next we shall look at different ways of outputting the data.

|-
| 02:33
|'''Percentage string operator''' is called as '''format operator'''.

|-
| 02:38
|For example:

'''Percentage d''' - specifies the '''integer format'''
'''Percentage s''' - specifies the '''string format''' and
'''Percentage f''' - denotes the '''float format'''

|-
| 02:52
| Switch back to the '''terminal'''. Next let us assign x as shown.

|-
| 03:00
|To print the value of '''x''', type as shown.

|-
| 03:06
|Here '''''percentage'' 3.2f''' specifies the output in '''float''' and '''.2f''' rounds off the value to two decimal point.

|-
| 03:18
| We will see one more example. Type as shown. Here, it rounds off to four decimal places.

|-
| 03:30
| Next, let us assign two more values. Type, '''y '''''is equal to''''' 2'''

|-
| 03:38
| '''z '''''is equal to inside double quotes '''''red'''

|-
| 03:43
| To print the value of '''x, y''' and '''z''', type as shown.

|-
| 03:50
|Various '''arguments''' can be passed to '''print''' using '''modifiers'''.

|-
| 03:55
|The values of x, y and z are substituted in place of the '''format specifiers''' as

'''percentage 2.1f, '''
'''percentage d '''and
'''percentage s''' respectively.

|-
| 04:09
| Pause the video. Try this exercise and then resume the video.

|-
| 04:15
|What happens when you execute the following?

|-
| 04:18
| Switch to the '''terminal''' for the solution.

|-
| 04:22
| Type as shown. Here the '''int''' value of '''x''' and '''float''' value of '''y''' are printed as per the '''format specifiers'''.

|-
| 04:34
|It prints six decimal places by default for '''float'''.

|-
| 04:39
| Usually '''print statement''' prints the output in a new line. Now we will see how to suppress the '''newline''' character.

|-
| 04:49
|Open a text editor and type the following code.

|-
| 04:53
| The newline character can be suppressed by passing '''end '''''is equal to inside single quotes''''' '''a''' space'''.

|-
| 05:01
| Save the script as '''print''''' underscore '''''example.py.'''

|-
| 05:07
| Switch back to the '''terminal'''.

|-
| 05:10
| Let us run the code by typing '''percentage run '''space''' print '''''underscore''''' example.py '''

|-
| 05:19
|We can see that the '''print statement''' prints a '''space''' instead of a new line.

|-
| 05:25
| Next we shall look at taking input from the user. We will use the '''input function''' for this.

|-
| 05:33
|Type '''ip '''''is equal to '''''input''''' open and close parentheses ''

|-
| 05:39
| The '''cursor''' is blinking indicating that it is waiting for an '''input'''. Type, '''an input''' and press '''Enter'''.

|-
| 05:49
| Now let us see what is the value of '''ip'''.Type '''ip''' We can see that it contains the '''string - an input'''

|-
| 06:00
| Pause the video. Try this exercise and then resume the video. Enter the number 5.6 as '''input''' and store it in a variable '''c'''.

|-
| 06:12
| Switch back to the '''terminal''' for the solution.

|-
| 06:16
| We have to use the '''input''' command with variable '''c'''. Type, '''c '''''is equal to''''' input '''''open and close parentheses''

|-
| 06:26
| Enter 5.6 as '''input'''. Press '''Enter'''.

|-
| 06:32
| To see the input value, type''' c'''

|-
| 06:36
| Now let us see the '''data type''' of '''c'''. Type, '''type '''''inside parentheses '''''c''' We see that '''c''' is a '''string'''.

|-
| 06:48
|Because '''input''' command always takes the '''input''' as '''string''' no matter whatever is the '''input'''.

|-
| 06:56
| Pause the video. Try this exercise and then resume the video.

|-
| 07:02
|Execute the below '''statement'''. What happens when you do not enter anything and hit '''Enter'''?

|-
| 07:10
| Switch back to the '''terminal''' for the solution.

|-
| 07:14
| Type '''d '''''is equal to''''' input '''''open and close parentheses'' Press '''Enter''' without giving any '''input'''.

|-
| 07:24
|Again press '''Enter''' to get the '''prompt'''.

|-
| 07:28
| To see the '''input''' value, type, '''d''' When nothing is entered, an empty '''string''' is considered as '''input'''.

|-
| 07:38
| We can also use '''input '''to display a '''prompt''' to assist the user.

|-
| 07:44
|Now we will give a '''prompt''' to get the '''input'''.
Type '''ip '''''is equal to''''' input '''''inside parentheses inside double quotes '''''Please enter a number '''''backslash''''' n'''

|-
| 07:58
| I will give 12 as '''input'''. This is how we can display a '''prompt''' to get '''input''' from user.

|-
| 08:08
| This brings us to the end of this tutorial.

|-
| 08:12
|Let us summarise. In this tutorial, we have learnt to,

|-
| 08:17
| Use '''print statement'''

|-
| 08:20
| Use the '''format specifiers ''percentage ''d, ''percentage ''f '''and''' ''percentage ''s''' in the '''print statement '''

|-
| 08:29
| Take '''input''' from user by using''' input function''' and Display a '''prompt''' to the user before taking the '''input'''

|-
| 08:39
| Here are some self assessment questions for you to solve '''a ''is equal to'' input ''open and close parentheses''''' and user enters '''2.5'''. What is the '''type''' of '''a'''?

|-
| 08:55
|2. If '''a ''is equal to'' 2 '''and '''b ''is equal to'' 4.5''', what is the result of the following action?

|-
| 09:05
| And the answers,

1. No matter what you enter, it will be taken as a '''string'''. Hence '''2.5''' is a '''string'''.

|-
|09:16
|2. Since '''b''' is called first, it will display '''integer''' value of '''b.''' Because the '''modifier''' used is''''' percentage ''d'''.

|-
| 09:28
|Similarly, '''float''' value of '''a''' will be displayed due to its '''modifier ''percentage ''2.1f'''. Hence the output is''' a is 4''' and '''b is 2.0'''

|-
| 09:42
| Please post your timed queries in this forum.

|-
| 09:46
| Please post your general queries on Python in this forum.

|-
| 09:51
| FOSSEE team coordinates the TBC project.

|-
| 09:55
| Spoken-tutorial is funded by NMEICT, MHRD, Govt. of India. For more details, visit this website.

|-
| 10:04
| This is Priya from IIT Bombay signing off. Thanks for watching.

|}

Python-3.4.3/C3/Input-output/English-timed - Revision history

Pratik kamble: Created page with "{| border = 1 | '''Time''' | '''Narration''' |- | 00:01 | Welcome to the spoken tutorial on '''Input and Output'''. |- | 00:06 |In this tutorial, we will learn to '''Prin..."