Python variable and type; In this tutorial, i am going to show you what is python variable and it’s type and how to use it with examples.
Python Variable and Type with example
What is the variable in python?
Basically a variable in python is nothing, but it only holds the data or any values in it. There is no special command to make it. You can easily change it value on runtime.
Before we talk more about python variable and it’s types, we should know the important things or rules for creating variables in the python programming language.
Rules for creating a variable in python
Rule 1: A variable name must begin with a letter or the underscore character
Rule 2: A variable name cannot begin with a number
Rule 3: The python variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
Rule 4: A Variable names are case-sensitive Like name, Name and NAME are three different variables
Python declare/create variable
Here first we will create/declare a variable. And also assign value to it.
x = 10
print("My fav no is " + x)
Change variable value in python
We will create a variable and change the value of this variable at runtime.
x = 10 print("My fav no is " + x) x = 15 print("My fav no is " + x)
Assigning a single value to multiple variables
Also Python allows to assign a single value to several variables simultaneously.
x = y = z = 10 print(x) print(y) print(z)
Assigning a different values to multiple variables
x, y, z = 5, "string", 99 print(a) print(b) print(c)
When you create/declare a variable in Python. So you do not need to declare its type. Python itself detects what type of value store in it. Means variable has numbers or is a string or float value is value, etc.
Note:- And if you do not assign any value type value to it, then it will throw the exception.
#int value myint = 7 print(myint) #float value myfloat = 7.0 print(myfloat) #string vlaue mystring = "hello" print(mystring) #invalid assigment invalid = 5 + "5" print(invalid)
How many types of variable in python?
Variables in Python programming are of two types, such as Local & Global Variables.
Which variables are made inside the function. They are called local variables. Local variables can be used only inside the function.
def valfun(): x = "great" print("Python is " + x) valfun()
Which variables are made outside the function. They are called global variables. Global variables can be used both inside and outside the function.
x = "great" def valfun(): print("Python is " + x) valfun()
Generally, when you create a variable inside any function, that is local variable. And you can not use this variable outside of the function.
You can create/define a global variable inside the function by using the global keyword.
def valfun(): global x x = "powerful" valfun() print("Python is " + x)