Class 11 AI Chapter - Python Topic - Token in Python

Why Python Programming language is so important?

Python programming language is general purpose, object oriented. Python language was developed by Gudio Van Rossum in Feb 1991. It is not as much high level language as C, C++, Java

Features of Python:
1) It is a high level language.
2) It is free and open source language.
3)It is platform independent language.
4) It is interpreted language.
5) It is easy to use and understandable language.

What is token in Python programming language?

Python programs are made of tokens which is the smallest unit recognized by compiler and interpreter. They are consisting of keywords, identifiers, literals, operators, and punctuators.

Tokens in Python

1) Keywords: Reserve words which are used in Python are called Keywords. Each word has some meaning in programming.

as	Not	Continue	Try	for	While	None
False	assert	Import	Else	Break	Class	def
Try	Or	With	And	Finally	Not	elif

2) Identifiers: An identifier is defined to declare as variable, function, class, and object. Keywords can’t be used as identifiers. It can be declared by using character, number except underscore.

3) Literals: Literals are the values which are given in a program. It could be string literals, number literals, Boolean literals, and special literals.

4) Operators: Operators are the symbols which perform operations on values. There are different types of operators like maths operators, logical operators, and relation operators.

5) Punctuators: Punctuators are the symbols which add meaning in a code. There are many Punctuators like {}, (), ;, “” @, ?, : etc.

Program 1:
Write a program to find area of a rectangle where length = 25 cm and breadth = 2 cm.

What are the different data types used in Python?

Data types reserves memory in a system to run a program. Data operates with operators like maths operator or logical operators. Python also accept dynamic data type which is defined run time in a program.

Data Type in Python

Data	Description	Example
Integer	stores whole numbers	B = 6
String	stores text enclosed in single or double quotes	Subject=’Hindi’
List	stores list of values of any data type separated with comma between square[]	List=[34,12.5,”maths”,”Hindi”]
Tuple	stores list of values of any data type separated with comma between parentheses()	tuple=(34,12.5,”maths”,”Hindi”)
Set	stores unordered set of values of any data type with no duplicate between braces{}	set={34,12.5,”maths”,”Hindi”}
Dictionary	stores unordered set of comma separated key: value pairs between braces	Dic={1:”one”, 2:”two”}
Float	Stores numbers with fraction	B=23.6
Complex	Stores a number have real and imaginary part	No=a+bc
Boolean	It has two values true & false	Result=false

How values are accepted from user in Python?

In Python input() function is used to accept values from user. By default it accepts string values, we use conversion function to change data type.

Program 2:
Write a program to accept name, three subjects marks, and find total of it.

Python Program