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Identifiers in Python

Identifiers in Python:


Identifiers are the names of entities used in a program, such as variables, functions, classes, modules, etc. In Python, identifiers are the names by which these elements are identified. Identifiers are an important part because they make the various parts of any program clear and understandable.

Definition of Identifiers:
In Python, identifiers are names used to identify a variable, function, class, module, or any other object in a program. They are used to uniquely define elements in a program.

Rules for Identifiers:
  • Can only use letters (a-z or A-Z), underscores (_), and digits (0-9).
  • Cannot start with a digit.
  • Can start with an underscore.
  • Cannot use Python keywords.
  • Are case-sensitive (`Name` and `name` are considered two different identifiers).
  • There is no limit on the length of an identifier in Python.

Advantages of Identifiers:
  • Clarity and Readability: Identifiers make the program more clear and readable.
  • Customizability: Through identifiers, programmers can name variables and functions according to their needs.
  • Reusability: Good identifiers can be used repeatedly in the program.
  • Code Management: Managing code becomes easier through identifiers.

Guidelines for Choosing Identifiers:
  • Meaningful Names: Always choose a name for an identifier that clearly indicates the function of that variable or function.
  • Use of Underscores: If the identifier name is long, use underscores to connect the words.
  • Correct Use of Case: It is necessary to be mindful of case sensitivity for identifiers in Python.
  • Avoid Keywords: Never use Python's keywords as identifiers.

In this Chapter

Identifiers in Python
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What is Python and its History
Advantages of Python
Python Versions
Features of Python
Areas of Python
IDLE in Python
Keywords in Python
Input/Output Syntax
Indentation
Variables
Dynamic Typing
Data Types in Python
What is an Operator?
Control Statements in Python
Arrays & Their Types
Strings in Python
Escape Sequences & Formatting in Python
Built-in Methods for Lists in Python
Basic Operations in Python
Lists & Tuples in Python
Sets in Python
Set Operations in Python
Dictionaries in Python
Dictionary Built-in Methods
Functions in Python
Variables & Their Types
Modules in Python
Packages in Python
Errors in Python
Opening & Closing Files in Python
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