Variables in Python
Variables are fundamental elements in programming that allow developers to store and manipulate data. In the context of Python programming, variables play a pivotal role in creating dynamic and interactive applications. In this article, we’ll delve into the concept of variables in Python, how they are declared and used, and their significance in writing efficient and effective code.
A variable is a named location in a computer’s memory that holds a value. It acts as a symbolic representation of data, enabling programmers to work with data in a flexible and organized manner. Variables can hold various types of information, such as numbers, characters, and more complex data structures.
In the below PDF we discuss about Variables in detail in simple language, Hope this will help in better understanding.
Variable Naming Rules :
When naming variables in Python, follow to these rules:
- Start with a letter or underscore: Variable names must begin with a letter (a-z, A-Z) or an underscore (_).
- Consist of letters, numbers, and underscores: Variable names can include letters, numbers, and underscores. Avoid using special characters or spaces.
- Case-sensitive: Python is case-sensitive, meaning myVar and myvar are treated as different variables.
- Avoid using reserved keywords: You cannot use Python’s reserved keywords like if, else, for, or while as variable names.
- Use descriptive names: Choose meaningful variable names that convey the purpose of the variable. For example, use total_price instead of tp for better code readability.
Declaring and Defining Variables :
In Python, declaring a variable involves specifying its type and name. The syntax is as follows:
# Integer variable
age = 30
# String variable
name = "John Doe"
# List variable
fruits = ["apple", "banana", "cherry"]
# Boolean variable
is_python_fun = True
A variable in Python is a named container that can hold data or values. It is used to store and manipulate data in a program.
You can declare a variable in Python by simply assigning a value to a name using the equals (=) operator. For example: my_variable = 10
You can assign a value to a variable using the assignment operator (=). For example: my_variable = 42
Yes, you can change the value of a variable by simply assigning a new value to it. For example: my_variable = 100 will change the value of my_variable to 100.
Python variables can store various types of data, including integers, floating-point numbers, strings, lists, dictionaries, and more.