Identifiers,variables,Reserved words.

*Identifiers *
A name in python program is known as identifier/variables or reference variables

Rules for identifiers in Python

• The first character is a letter (a-z, A-Z) or an underscore _.
• The remaining characters are letters, digits 0-9 or underscores.
• It can’t be one of the reserved keywords
• Case matters: total and Total are consider as two different names.
• There’s no length limit.

Name='gobi' //name is identifier
isStudent= True //isStudent is identifier
Rollno=12  //Rollno is identifier

can start with underscore() and double underscore(_)

_name='gobi' //single underscore is also known as  private
__rollno=13 //double underscore is also known as strictly private

Reserved Words or Keywords

we can't use the keywords as identifier or variables.

import keyword
print("The list of keywords are : ")
print(keyword.kwlist)

output:
The list of keywords are: 
['False', 'None', 'True', 'and', 'as', 'assert', 'async', 'await', 'break', 'class', 'continue', 'def', 'del', 'elif', 'else', 'except', 'finally', 'for', 'from', 'global', 'if', 'import', 'in', 'is', 'lambda', 'nonlocal', 'not', 'or', 'pass', 'raise', 'return', 'try', 'while', 'with', 'yield']