Difference between revisions of "Python/C3/I-O/English-timed"
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Latest revision as of 12:56, 10 March 2017
| Time | Narration |
| 00:00 | Hello friends and welcome to this tutorial on 'Input/Output'. |
| 00:05 | 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. |
| 00:20 | So type ipython in the terminal. |
| 00:26 | Type a = within double quotes This is a string
Type a Type print a |
| 00:45 | obviously, print a , prints the value of a . |
| 00:52 | As you can see, even when you type just a, the value of a is shown. |
| 00:59 | But there is a difference. |
| 01:01 | Typing just a displays the content of a whereas the statement print a prints the string itself. |
| 01:08 | This difference becomes more evident when we use strings with newlines in them. |
| 01:14 | Type b = within double quotes A line backslash n New line and hit enter
Type b Type print b |
| 01:35 | 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. |
| 01:46 | 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. |
| 02:00 | We shall look at different ways of outputting the data. |
| 02:04 | print statement in python supports string formatting. |
| 02:08 | Various arguments can be passed to print using modifiers. |
| 02:12 | 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
|
| 02:51 | 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. |
| 03:03 | Pause the video here, try out the following exercise and resume the video. |
| 03:08 | What happens when you do print within double quotes x is modula d comma y is modula f modula x comma y |
| 03:19 | Switch to the terminal for solution. |
| 03:24 | Type print within double quotes x is modula d comma y is modula f modula within brackets x comma y |
| 03:50 | We see that the int value of x and float value of y are printed corresponding to the modifiers used in the print statement. |
| 03:58 | We have seen that print statement prints a new line character every time it is called. |
| 04:04 | This can be suppressed by using a " comma " at the end of the print statement. |
| 04:13 | Let us see this by typing out following code on an editor as print underscore example.py |
| 04:24 | So Type.. |
| 04:44 | print "Hello"
print "World" print "Hello" comma print "World" |
| 05:22 | Save the script as 'print underscore example.py' and run it using modula run slash home slash fossee slash print underscore example.py |
| 05:34 | As we can see, the print statement when used with comma in the end, prints a space instead of a new line. |
| 05:46 | Now we shall look at taking input from the user. |
| 06:06 | We will use the ~~raw underscore input~~ for this. |
| 06:11 | So type ip = raw underscore input() |
| 06:23 | The cursor is blinking indicating that it is waiting for input, so type something and hit enter. |
| 06:32 | So you can type an input |
| 06:35 | Now let us see what is the value of ip by typing it. |
| 06:41 | So type ip on the terminal and hit enter |
| 06:45 | We can see that it contains the string "an input" |
| 06:51 | Pause the video here, try out the following exercise and resume the video. |
| 06:58 | You have an question |
| 07:02 | Enter the number 5.6 as input and store it in a variable called c. |
| 07:11 | Switch to the terminal for solution. |
| 07:15 | We have to use the raw underscore input command with variable c. |
| 07:19 | So type c = raw underscore input() and hit enter
Put 5.6 And again enter. Type c |
| 07:36 | Now let us see the type of c. |
| 07:40 | Type type within brackets c |
| 07:46 | We see that c is a string. |
| 07:49 | This implies that anything you enter as input, it will be taken as a string no matter what you enter. |
| 07:55 | Pause the video here, try out the following exercise and resume the video. |
| 07:59 | What happens when you do not enter anything and hit enter. |
| 08:04 | Switch to the terminal for solution. |
| 08:08 | Type d = raw underscore input(). Type d |
| 08:28 | We see that when nothing is entered, an empty string is considered as input. |
| 08:32 | raw underscore input also can display a prompt to assist the user. |
| 08:37 | So type name = raw underscore input within brackets within double quotes Please enter your name: |
| 08:48 | It prints the string given as argument and then waits for the user input. |
| 08:54 | Let us do one more exercise. |
| 08:56 | Pause the video here, try out the following exercise and resume the video. |
| 09:00 | How do you display a prompt and let the user enter input in next line. |
| 09:09 | Switch to the terminal now. |
| 09:12 | The trick is to include a newline character at the end of the prompt string. |
| 09:17 | Type ip = raw underscore input within brackets within double quotes Please enter a number in the next line backslash n |
| 09:28 | It prints the newline character and hence the user enters input in the next line |
| 09:35 | This brings us to the end of the tutorial. |
| 09:39 | In this tutorial, we have learnt to, Use the print statement. |
| 09:42 | Use the modifiers modula d, modula f, modula s in the print statement. |
| 09:47 | Take input from user by using raw underscore input(). |
| 09:55 | 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 | 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 | 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. |
