Walrus Operator in Python 3.8

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Introduction

Walrus Operator — it is another name for assignment expressions. According to the official documentation, this is the way to assign variables in an expression using the NAME: = expr notation. Assignment expressions allow you to assign a value to a variable, even to a variable that does not yet exist, in the context of the expression, rather than as a separate statement.

Code :

a = [ 1 , 2 , 3 , 4 ]

if (n: = len (a)) & gt; 3 :

print (f "List is too long ({n} elements, expected & lt; = 3) " )

Output:

Here, instead of using "len (a)" in two places, we assigned it to the variable "n", which can be used later. This helps us eliminate code duplication and improve readability.

Example —

Let’s try to understand the assignment expressions more clearly with an example using both Python 3.7 and Python 3.8. Here we have a list of dictionaries named "sample_data" that contains userId, name, and a boolean named complete.

sample_data = [

{ "userId" : 1 , "name" : "rahul" , "completed" : False },

{ "userId" : 1 , " name " : " rohit " , "completed" : False },

{ "userId" : 1 , "name" : "ram" , "completed" : False },

{ "userId" : 1 , " name " : " ravan " , "completed" : True }

]

print ( "With Python 3.8 Walrus Operator: " )

for entry in sample_data:

if name: = entry. get ( "name" ):

print (f ’Found name:" {name} "’ )

print ( " Without Walrus operator: " )

for entry in sample_data:

name = entry.get ( "name" )

if name:

print (f ’Found name:" {name} "’ )

Exit:

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We hope this article has helped you to resolve the problem. Apart from Walrus Operator in Python 3.8, check other code Python module-related topics.

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Julia Innsbruck

Tallinn | 2023-02-01

code Python module is always a bit confusing 😭 Walrus Operator in Python 3.8 is not the only problem I encountered. I am just not quite sure it is the best method

Olivia Sikorski

Tallinn | 2023-02-01

Maybe there are another answers? What Walrus Operator in Python 3.8 exactly means?. Will get back tomorrow with feedback

Chen Lehnman

Vigrinia | 2023-02-01

Thanks for explaining! I was stuck with Walrus Operator in Python 3.8 for some hours, finally got it done 🤗. Checked yesterday, it works!

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