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How to check if a variable is none in python

Hello guys. How are you all? I hope you all fine. In this tutorial we will learn about How to check if a variable is none in python. In python a variable is one type of box which stores data in it. It should be integer, float, set, dictionary or tuple. If it contains none than it have to no data in it. Here we are going to learn about of this. If the variable is empty and there is no data available than how can we check about the variable is none. So lets learn this by given below methods. I hope it will help you.

How to check if a variable is none in python

  1. check if a variable is none in python

    to check if a variable is none in python just Use isinstance(). By using isinstance() you can check the variable is none or not. isinstance() is used to check the type of variable. by using type(none) you can check the variable is none or not. Lets learn this by given below example: var1 = None var2 = 25 print((var1, isinstance(var1, type(None)))) print((var2, isinstance(var2, type(None))))
    Output : (None, True) (25, False)

  2. How to check if a variable is none in python

    to check if a variable is none in python just Use is keyword. By using is keyword you can check the variable is none or not. Lets see this by given example. Here i am using two variables to check the which is none and which is not. You can check by is statement. Lets learn this: var1 = None var2 = 25 if(var1 is None): print("var1 is None") if(var2 is not None): print("var2 is not None") Output : var1 is None var2 is not None

Method 1: Use isinstance()

By using isinstance() you can check the variable is none or not. isinstance() is used to check the type of variable. by using type(none) you can check the variable is none or not. Lets learn this by given below example:

var1 = None
var2 = 25
print((var1, isinstance(var1, type(None))))    
print((var2, isinstance(var2, type(None))))

Output :

(None, True)
(25, False)

Method 2: Use is keyword

By using is keyword you can check the variable is none or not. Lets see this by given example. Here i am using two variables to check the which is none and which is not. You can check by is statement. Lets learn this:

var1 = None
var2 = 25
if(var1 is None):
    print("var1 is None")
if(var2 is not None):
    print("var2 is not None")

Output :

var1 is None
var2 is not None

Method 3: Use try and except

You can also use try and except to check the variable is none or not. By using it you can check it. Here i have been take the two variables to check if they are none or not or one of them is none or not. Lets learn this by given below example:

var1 = None
var2 = 25
try:
    mysum = var1 + var2
except:
    print("One variable is None")

Output :

One variable is None

Conlusion

Hope all 6 Method Are Useful For You. Comment Below Which Method You Used To Convert String To Datetime In Python. Thank You.

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