Variables in Python

Variables are fundamental elements in programming used to store data that can be referred to and manipulated in a program. In Python, variables are created when you assign a value to them, and they do not need an explicit declaration to reserve memory space. The declaration happens automatically when you assign a value to a variable.

a = 100 (# a is variable here)

Declaring and Assigning variables:-

#declaring and assigning variables
age = 10
height= 6.1
name = "Pravesh"
is_roll_no = True

print("age:",age)
print("height",height)
print("name",name)
print("is_roll_no",is_roll_no)

Naming conversion:-

• "Please ensure that the variable names are descriptive."
• they must always start with a letter or can start with "_”, and can contain letters, numbers, and underscores.
• “Variable names are case-sensitive.”

valid variable names:-

_age = 10
name_of_student = "Pravesh"
roll_1 = True

print(_age)
print(name_of_student)
print(roll_1)

Invalid variable name:-

#invalid variable names
1age = 10 
name-of-student = "Pravesh"
roll-1 = True

print(1age)
print(name-of-student)
print(roll-1)

it will give us an error.

Case Sensitive:-

#case sensitivity
name = "Jiger"
Name = "grewal"
print(name)
print(Name)

Variable Types:-

Python is a dynamically typed programming language, meaning the type of variables is determined at runtime.

#variables type
age = 5
name = "Pravesh"
height = 6.0
student =True

print("type of age is",  type(age))
print("type of name is",  type(name))
print("type of height is",  type(height))
print("type of student is",  type(student))

Type checking and conversion:-

we can change the datatypes of variables.

#type checking and conversion

a = 10
b = 20

print(type(a))
print(type(b))

a = str(a)
b = str(b)

print(type(a))
print(type(b))

age = “jiger”

print(int(age))

we can't change long name to int we will get an error

Dynamic typing:-

In Python, variables can change type during the execution of a program.

#dynamic typing
var = 10
print(var)
var = "Pravesh"
print(var)

we can do this multiple times.

Index:-

we have an amazing function in Python called input, which allows us to take user input.

#input
age = int(input("enter your age"))
print("your age is",age)

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