Variables are containers for storing data values.
What is a Python Variable?
You can use variables in Python to store data. Variables can store string, integer, and float values. Variables can also store lists of data. Variables can be local to a function, class, module, or even the entire program.
When to use a Python Variable?
Variables can be used to store values that do not need to be in a constant state. These include variables used for input and output, as well as variables that are needed for calculations.
Why do we use Variables?
We use variables for storing data because it allows us to store data in a convenient and efficient way. It also allows us to access the stored data later. We can use variables to store information such as passwords, secret
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Local Variable
A local variable is a variable that is defined in a function, class, or module. It is stored in the current scope. Local variables can only be accessed from the function or module that they are defined in.
Local Variable Example
def my_func():
local my_local_var
Global Variable
You can create global variables using the global keyword. The global keyword is used to define a variable outside of any function, class, or module. A global variable is a variable that is defined outside of a function, class, or module. It is stored in the global scope. Global variables can be accessed from anywhere within the program.
Global Variable Example
def my_func():
global my_global_var
Static variable
A static variable is a variable that can be accessed from anywhere within a class or module. A static variable is stored in the class or module where it is defined. It is not stored in the global scope. A static variable can only be accessed from the class or module where it is defined.
Static variable example
class MyClass:
def __init__(self):
self.my_var = "my value"
In the example above, my_var is a static variable. It can be accessed from any function in the class MyClass.
class MyClass:
def __init__(self):
self.my_var = "my value"
def function1(self):
print(self.my_var)
def function2(self):
print(self.my_var)
Defining a Variable
The Python variable can be defined as a variable of any type, such as a string, integer, or float. The Python variable is defined by the following syntax:
Variable = Expression
In this syntax, the variable name is enclosed in parentheses.
Example 1
# Define a variable
a = 1
# Use the variable
print a
1
The expression can be any valid Python expression. In this example, the variable is assigned a value of 1.
Example 2
# Define a variable
a = "foo"
# Use the variable
print a
foo
Variable Assignment
We use variable assignment to store values into a variable.
Variable initialization
Variable initialization is used to assign a value to a variable.
Python Variable Types
Python variables can be assigned to one of three different types: string, integer, and float. These variables are initialized using one of the following methods:
What is the difference between a variable and a constant?
variable
A variable is a container that stores data. The data can be assigned to the variable, read from the variable, and even be changed by the variable.
Python variables are also used to declare constants. These variables are also initialized, but they are not assigned to. Instead, their values are declared and then they are never changed. The difference between a variable and a constant is that variables can be reassigned. A constant cannot be reassigned.
constant
A constant is a fixed value. It cannot be changed, and it cannot be reassigned. It is useful when you need a value that you can use in multiple places in your program.
A constant is a value that is never changed. A variable is not a constant.
What are different types of variables?
A variable can be assigned to one of three different types: string, integer, and float. These variables are initialized using one of the following methods:
Type-Specific Initialization
Python variables are initialized using one of the following methods:
Type-Specific Initialization
Initialization Method
string - A string is a variable that can hold characters, numbers, and special characters. The variable can hold a character, a number, or a string of characters and numbers.
int - An integer is a variable that can hold whole numbers. The variable can hold a whole number, a fractional number, or a negative whole number.
float - A float is a variable that can hold whole numbers. The variable can hold a whole number
Naming Convention for Variables and constants
Variable names should be short, to make the code easier to read. The naming convention for variable names is to use one or more lowercase letters, mixed with numbers and underscores.
Constants are constants and should have a capital letter at the beginning. The naming convention for constants is to use a capital letter at the beginning, mixed with numbers and underscores.