Python Variables

Variables are basic building blocks of a programming language to store the value, reuse it in code, and modify the value.

Variables are names, assigned with a value, then reused the value in other places of a code.

It points to the memory location for the assigned value.

Variables in Python are dynamically typed values, which means variables are assigned a value without defining a datatype.

m=20;
print(m); #20

Variables can be reassigned with new values as per give below example

m=20;
m=m+1;
print(m);#21

variables can change their type by assigning a new value type

m=20;
m="hello";
print(m);#hello

Multiple variables can be declared in a single statement using comma-separated

id, name, salary = 1, 'john', 4000
print(id);#1
print(name);#john
print(salary);#4000

How to create a variable in Python

Variables are declared using name and value with assignment operator =.

str="name"

str is declared and assigned with a value of name.

variables names either short or long
Python recommends names are in lowercase with underscore by convention, not compulsory
Usually, Variable names are identifier that always starts with either alphabets or underscore characters
alphabets contain a to z or 0-9
It does not start with a letter
Names are case-sensitive, variable names such as str, Str, STR are three different variables

Valid variable names are

Invalid variable names are