Identifiers in python

• A name in python program is called identifier.
• It can be a class name or function name or variable name

Rules to define identifier

• Identifiers include alphabets symbols(either lower case or upper case)
• Identifiers include  digits(0 to 9)
• Identifiers include underscore (_)symbol.
• Identifiers should be case sensitive.

Don’t s while defining an identifier

• We cannot use keywords as identifiers
• Identifiers should not start with digit.

Special case of using underscore

• If the identifier starts with underscore (_)symbol then it is private.

Variables in python

What is a variable?

•   A variable refers to  memory location.

•   It is used to store the value .

•   Variable is used to give data to the computer for processing .

Specifying a variable

•   In python we don’t need to specify the type of variable because python is a dynamically typed to get variable type.

•  Variable names include  letters and digits but they have to begin with a letter or an underscore.

•   It is suggested to use  lowercase letters for variable name