The Beginner’s Guide to Python Variables

Variables in any programming language are like a small temporary container. which is used to store the data for temporary purposes in a ram.

Let’s see how to declare a variable in python and what other things we can do with python variables.

Creating Variables

Python has no rule or command for declaring or defining a variable.

A variable creates a space inside RAM when the first value is get initialized to it.

Example

x = 400 # x is of type int
x = “Wakeupcoders” # x is now of type str
print(x)

Python Rules for Naming a Variable:

In a python, we can declare a variable like a, b, or c or it's always better to give some meaningful and descriptive name like car, book, or age as per the requirement.

Let’s see some of the rules of declaring variables.

* Variable should always start with an alphabet letter or we can also use underscore.

* We can not initialize with the number.

* Variable names are always case sensitive.

* Variable should contain alphanumeric characters, numbers and underscores.

How to Handle Multi-Words Variable Names

In a multi-word variable, it could be difficult to read. Let’s see how we can make it more convenient to read.

Camel Case

myVariableName = “Wakeupcoders”

Pascal Case

MyVariableName = “Wakeupcoders”

Snake Case

my_variable_name = “Wakeupcoders”

How to Handle Assigning Multiple Values to Variables

We can assign multiple values to variables.

Assign Many Values to Multiple Variables

x, y, z = “Wakeupcoders 1”, “Wakeupcoders 2”, “Wakeupcoders 3”
print(x)
print(y)
print(z)

Assigning One Value to Multiple Variables

x = y = z = “Wakeupcoders”
print(x)
print(y)
print(z)

Unpacking a Collection

fruits = [“apple”, “banana”, “cherry”]
x, y, z = fruits
print(x)
print(y)
print(z)

How to Use Global Variables in Python?

Global Variables

Global variables are always declared outside of a function and they can be accessed both, inside and outside of the function.

Example:

x = “Wakeupcoders”
def myfunction():
print(“Python by “ + x)
myfunction()

When you create a variable with the same name inside a function, it becomes local and can only be used within the function. The global variable with the same name will remain global and have the same value as before.

Example:

x = “awesome”
def myfunc():
x = “Wakeupcoders”
print(“Python by “ + x)
myfunc()
print(“Python is “ + x)

Global Keywords in Python

When you create a variable within a function, it is usually local and can only be used within that function.

The global keyword can be used to create a global variable within a function.

Example:

def myfunction():
global x
x = “Wakeupcoders”
myfunc()
print(“Python by “ + x)

End of Blog

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Credit:

Narayan Jha(author), Purnima Sinha(editor), Anjali Jha(digital marketing)