Variables:
Key aspects of variables in Python:
Variable Assignment: You can assign a value to a variable using the assignment operator (=).
Dynamic Typing: Python is dynamically typed, meaning you don’t need to declare the type of a variable explicitly. The type is inferred based on the value assigned to it. You can assign different types of values to the same variable. For example:
Variable Names: Variable names must follow certain rules:
- They can contain letters (both uppercase and lowercase), digits, and underscores (_).
- They cannot start with a digit.
- They are case-sensitive (myVar and myvar are different variables).
Data Types: Variables can hold different types of data, including integers, floating-point numbers, strings, lists, dictionaries, and more. The type of the value assigned to a variable can change during the execution of the program.
Memory Allocation: When a variable is assigned a value, Python reserves memory to store that value. The memory location can be accessed by using the variable name.
Variable Usage: You can use variables in expressions, pass them as arguments to functions, update their values, and perform various operations on them.
Variables play a crucial role in programming as they enable you to store and manipulate data. They provide flexibility and allow you to write dynamic and reusable code by referencing and updating values stored in memory throughout your program.
Examples of variables:
#Here are some examples of using variables in Python:
x = 10
y = 5
result = x + y
print(result)
name = "Rana"
greeting = "Hello, " + name
print(greeting)
numbers = [1, 2, 3, 4, 5]
sum_of_numbers = sum(numbers)
print(sum_of_numbers)
intvar , floatvar , strvar = 10,2.57,"Python Language"
print(intvar)
print(floatvar)
print(strvar)
p1 = p2 = p3 = p4 = 44
print(p1,p2,p3,p4)
Output: 15 Hello, Rana 15 10 2.57 Python Language 44 44 44 44
