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

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.

Contributors and Content Editors

Pratik kamble