Python language basics 8: assigning nulls


In the previous post we finished looking into how boolean types are represented in Python. This short post will show how nulls are represented. We use nulls to indicate the absence of any value in a variable.


If you have a C# or Java background then you’ll first guess will be that nulls are assigned by the keyword ‘null’, right? Let’s see:

hello = null

The compiler won’t like that. Instead, the keyword ‘None’ – strictly with a capital N – is reserved for this purpose. I still like VB.NET’s ‘Nothing’ most but ‘None’ is also more imaginative than a simple ‘null’ 🙂

hello = None

Checking whether a variable is null is performed with the ‘is’ and ‘is not’ operators. You’ll get a warning in the PyCharm IDE if you try to test for None using the equality operator ‘==’:

res = hello == None

Instead, write as follows:

res1 = hello is None
res2 = hello is not None

res1 will be True and res2 will accordingly be False.

Read all Python-related posts on this blog here.


About Andras Nemes
I'm a .NET/Java developer living and working in Stockholm, Sweden.

One Response to Python language basics 8: assigning nulls

  1. Brian Dead Rift Webb says:

    Reblogged this on Brian By Experience.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

Elliot Balynn's Blog

A directory of wonderful thoughts

Software Engineering

Web development

Disparate Opinions

Various tidbits

chsakell's Blog


Once Upon a Camayoc

Bite-size insight on Cyber Security for the not too technical.

%d bloggers like this: