Python/C3/I-O/English-timed

Visual Cue	Narration
0:00	Hello friends and welcome to this tutorial on 'Input/Output'.
0:05	At the end of this tutorial,you will be able to, Print some value. Print using modifiers. Take input from user. Display a prompt to the user before taking the input.
0:20	So type ipython in the terminal.
0:26	Type a = within double quotes This is a string Type a Type print a
0:45	obviously, print a , prints the value of a .
0:52	As you can see, even when you type just a, the value of a is shown.
0:59	But there is a difference.
1:01	Typing just a displays the content of a whereas the statement print a prints the string itself.
1:08	This difference becomes more evident when we use strings with newlines in them.
1:14	Type b = within double quotes A line backslash n New line and hit enter Type b Type print b
1:35	As you can see, just typing b shows that b contains a newline character but While typing print b,it prints the string and hence the newline.
1:46	Moreover when we type just a , the value a is shown only in interactive mode and does not have any effect on the program while running it as a script.
2:00	We shall look at different ways of outputting the data.
2:04	print statement in python supports string formatting.
2:08	Various arguments can be passed to print using modifiers.
2:12	type x = 1.5 y = 2 z = within double quotes red print then in double quotes x is modula 2 dot 1f comma y is modula d comma z is modula s then again a modula within brackets x comma y comma z
2:51	As you can see, the values of x, y and z are substituted in place of the modifiers modula 2.1f, modula d and modula s respectively.
3:03	Pause the video here, try out the following exercise and resume the video.
3:08	What happens when you do print within double quotes x is modula d comma y is modula f modula x comma y
3:19	Switch to the terminal for solution.
3:24	Type print within double quotes x is modula d comma y is modula f modula within brackets x comma y
3:50	We see that the int value of x and float value of y are printed corresponding to the modifiers used in the print statement.
3:58	We have seen that print statement prints a new line character every time it is called.
4:04	This can be suppressed by using a " comma " at the end of the print statement.
4:13	Let us see this by typing out following code on an editor as print underscore example.py
4:24	So Type..
4:44	print "Hello" print "World" print "Hello" comma print "World"
5:22	Save the script as 'print underscore example.py' and run it using modula run slash home slash fossee slash print underscore example.py
5:34	As we can see, the print statement when used with comma in the end, prints a space instead of a new line.
5:46	Now we shall look at taking input from the user.
6:06	We will use the ~~raw underscore input~~ for this.
6:11	So type ip = raw underscore input()
6:23	The cursor is blinking indicating that it is waiting for input, so type something and hit enter.
6:32	So you can type an input
6:35	Now let us see what is the value of ip by typing it.
6:41	So type ip on the terminal and hit enter
6:45	We can see that it contains the string "an input"
6:51	Pause the video here, try out the following exercise and resume the video.
6:58	You have an question
7:02	Enter the number 5.6 as input and store it in a variable called c.
7:11	Switch to the terminal for solution.
7:15	We have to use the raw underscore input command with variable c.
7:19	So type c = raw underscore input() and hit enter Put 5.6 And again enter. Type c
7:36	Now let us see the type of c.
7:40	Type type within brackets c
7:46	We see that c is a string.
7:49	This implies that anything you enter as input, it will be taken as a string no matter what you enter.
7:55	Pause the video here, try out the following exercise and resume the video.
7:59	What happens when you do not enter anything and hit enter.
8:04	Switch to the terminal for solution.
8:08	Type d = raw underscore input() <RET> d
8:28	We see that when nothing is entered, an empty string is considered as input.
8:32	raw underscore input also can display a prompt to assist the user.
8:37	So type name = raw underscore input within brackets within double quotes Please enter your name:
8:48	It prints the string given as argument and then waits for the user input.
8:54	Let us do one more exercise.
8:56	Pause the video here, try out the following exercise and resume the video.
9:00	How do you display a prompt and let the user enter input in next line.
9:09	Switch to the terminal now.
9:12	The trick is to include a newline character at the end of the prompt string.
9:17	Type ip = raw underscore input within brackets within double quotes Please enter a number in the next line backslash n
9:28	It prints the newline character and hence the user enters input in the next line
9:35	This brings us to the end of the tutorial.
9:39	In this tutorial, we have learnt to,1. Use the print statement.
9:42	2. Use the modifiers modula d, modula f, modula s in the print statement.
9:47	3. Take input from user by using raw underscore input().
9:55	4. Display a prompt to the user before taking the input by passing a string as an argument to raw underscore input.
10:04	Here are some self assessment questions for you to solve
10:08	1. a = raw underscore input() and user enters 2.5 .
10:13	What is the type of a? str int float char
10:20	2. a = 2 and b = 4.5.
10:27	What does ``print "a is modula d and b is In line literal start-string without end-string. modula 2.1f" modula within brackets b comma a`` print? a is 2 and b is 4.5 a is 4 and b is 2 a is 4 and b is 2.0 a is 4.5 and b is 2
10:50	And the answers,
10:53	1.No matter what you enter, it will be taken as a string.
10:58	Hence 2.5 is a string.
11:01	2. Since 'b' is called first, It will display integer value of 'a' because the modifier used is modula d.
11:10	Similarly, 'b' will get the float value of 'a' due to it's modifier modula 2.1f.
11:18	Hence 'a' will be 4 and 'b' 2.0 .
11:24	Hope you have enjoyed this tutorial and found it useful.

Contributors and Content Editors

Gaurav, Minal, PoojaMoolya, Sneha