Sunday, May 26, 2024

Identifiers and Variables in Python

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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

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