MOST OF THE STUDENTS QUESTION IS THAT:HOW TO START LEARNING PYTHON ?? LETS START FROM --"TOKENS"

What is token ??

individual words and punctuation mark are called tokens or lexical units or lexical elements.

            

                     or 

the smallest individual unit in a program is known as a Token.

Tokens are of five type:

1.Keywords                              2.Identifiers(names)

3.Literals                                  4.Operators

5.Punctuators 

1.What is keyword??

                                

keyword are the words that convey a special meaning to the language compiler/interpreter.These are reserved for special purpose and must not be used as normal identifier names.

2.What are identifiers(Name)??

identifiers are  fundamental building of blocks of a program and are used as the general terminology for the names given to different parts of program viz.variables, objects, classes, functions, lists etc.

__identifier forming rules of python:

1. Identifiers can be a combination of letters in lowercase (a to z) or uppercase (A to Z) or digits (0 to 9) or an underscore _. 
2. An identifier cannot start with a digit.
3. Keywords cannot be used as identifiers.
4. We cannot use special symbols like !, @, #, $, % etc. in our identifier.
5. An identifier can be of any length.

3.What are Literals ??

Literals are data items that have a fixed value.python allows several kinds of literals:

a.string literals                 b. Numeric literals

c.Boolean literals             d.Special literals(None)

e.literal collection

4.What are Operators ??

Operators are tokens that  triggers some computation when applied to variables and other objects in a expression.Variables and object to which the computation is applied, are called operands. 

So, operators required some operands to work upon.

  

Operators are of two types:

a.Unary Operators: are that operator which require only one operand 

   eg:  -5,+5 etc 

b.Binary Operators:that requires two operands to work upon

eg: 7+8 etc

5.What are  Punctuators ??

punctuartors are the symbols that are used in programming language to organize  sentence structure, and indicate the rhythm and  emphasis of expression , statements , and program structure.

eg:!,@,#,$,%,^,&,*,(,) etc.

 

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