Python-3.4.3/C3/Basic-datatypes-and-operators/English-timed

Time	Narration
00:01	Welcome to the spoken tutorial on Data types and operators.
00:06	In this tutorial, we will learn about- Data types in Python like Numbers and Boolean
00:16	and Operators in Python like Arithmetic operators and Boolean operators
00:25	To record this tutorial, I am using Ubuntu Linux 16.04 operating system Python 3.4.3 and IPython 5.1.0
00:39	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	There are three built-in data types in Python to represent numbers. int float and complex
01:01	Let us start ipython. Open the terminal.
01:06	Type ipython3 and press Enter.
01:12	From here onwards, remember to press the Enter key after typing every command on the terminal.
01:19	Let's first see about int. Type a is equal to 13
01:26	Type a Now, we have our first int variable a.
01:32	To see the type of a, type, type inside parentheses a.This means that a is of integer data type.
01:42	There are some functions associated with the int data type to manipulate it.
01:48	These can be explored by typing a dot and then press the tab key. Here you can see the list of functions.
01:58	int data type can hold integers of any size.
02:02	Let us see an example. Type b is equal to 20 times 9 Here we are storing 9, repeated 20 times in b.
02:15	Type type inside parentheses b We can see that type of b is integer.
02:23	Next we will see about float data type. Type p is equal to 3.141592
02:33	Type type inside parentheses p We can see that type of p is float.
02:41	The last data type in the list is complex number. Type c is equal to 3.2 plus 4.6j
02:51	It is just a combination of two floats. The imaginary part being defined by j notation instead of i.
03:00	Complex numbers have a lot of functions specific to them. Type c dot and then press the tab key.
03:09	Let us try some of them. Type c dot real
03:15	Type c dot imag
03:18	c dot real gives the real part and c dot imag gives the imaginary part of the complex number.
03:27	We can get the absolute value of c by typing, abs inside parentheses c
03:35	Python also has Boolean as a built-in type. To try it out, just type, t is equal to True, T in capital
03:47	Now you can apply different Boolean operations on t. For example, type f is equal to not t
03:58	To see the value of f, type f
04:03	Type f or t. The output is True.
04:10	Type f and t. The output is False.
04:16	What if you want to apply one operator before another?
04:21	We can use parentheses for precedence. Let us write a small code to check this out. Type, a is equal to False
04:33	Type, b is equal to True
04:37	Type, c is equal to True
04:41	Now we will check how precedence changes with parenthesis.
04:46	Let us try two expressions and their evaluations.
04:51	Type, inside parentheses a and b or c
04:57	This expression gives the value True.
05:01	Now type a and inside parentheses b or c It gives the value False.
05:11	Let's now look at some operators available in Python3.
05:16	Python uses plus sign for addition. Type, 23 plus 74
05:24	Minus sign for subtraction.Type, 23 minus 56
05:32	Asterisk sign for multiplication. Type, 45 asterisk 76
05:41	slash sign for division. Type, 384 slash 16
05:51	Let us move ahead with operators.
05:55	Percentage sign for modulo operation. Modulo operator gives reminder value.
06:03	Type, 87 percentage sign 6
06:08	Two asterisks for an exponent. Type, 7 asterisk asterisk 8
06:17	In case, we may want to use the current value of variable in which the result is stored in the expression.
06:25	We can do that by putting the operator before equal to.
06:30	Let us say, a is equal to 73
06:35	Type, a asterisk equal to 34 To see the value of a, type, a
06:44	Again we will assign the same value to a by typing, a is equal to 73
06:52	Type, a is equal to a asterisk 34.
06:58	Type a You can see that both the expressions are giving the same value.
07:05	Pause the video. Try this exercise and then resume the video. Find the square root of 3 using Python.
07:15	The solution is on your screen. 3 asterisk asterisk 0.5 gives the square root of 3.
07:24	Pause the video. Try this exercise and then resume the video.
07:30	Will you get the same value for the below expressions?
07:34	Switch to the terminal for the solution.
07:37	Type, 3 asterisk asterisk 0.5. This operation gives a float.
07:45	Type, 3 asterisk asterisk 1/2 This operation also gives a float, but different value. Hence, we will not get the same value for the expressions.
07:59	To get the same value, type, 3 asterisk asterisk inside parentheses 1/2 We can see that now the values are same.
08:11	This brings us to the end of this tutorial.
08:15	In this tutorial, we have learnt about, data types in Python like Numbers and Boolean and
08:22	Operators in Python like Arithmetic Operators and Boolean Operators
08:28	Here are some self assessment questions for you to solve What are the three built-in data types in Python to represent numbers? Which operator is used to find exponent?
08:42	And the answers, 1. The built-in data types are int float and complex
08:51	2.**Two asterisks are used to find exponent.
08:56	Please post your timed queries in this forum.
09:00	Please post your general queries on Python in this forum.
09:05	FOSSEE team coordinates the TBC project.
09:09	Spoken Tutorial Project is funded by NMEICT, MHRD, Govt. of India. For more details, visit this website.
09:20	This is Priya from IIT Bombay signing off. Thanks for watching.

Contributors and Content Editors

Pratik kamble