Referring to the null object in Python

python null
Lizard picture Lizard · Jul 20, 2010 · Viewed 1.7M times · Source

How do I refer to the null object in Python?

Answer

Ben James picture Ben James · Jul 20, 2010

In Python, the 'null' object is the singleton None.

The best way to check things for "Noneness" is to use the identity operator, is:

if foo is None:
    ...

Related questions

How to select rows with one or more nulls from a pandas DataFrame without listing columns explicitly?

I have a dataframe with ~300K rows and ~40 columns. I want to find out if any rows contain null values - and put these 'null'-rows into a separate dataframe so that I could explore them easily. I can create a …

Read More
return, return None, and no return at all?

Consider three functions: def my_func1(): print "Hello World" return None def my_func2(): print "Hello World" return def my_func3(): print "Hello World" They all appear to return None. Are there any differences between how the returned value of …

Read More
What is a 'NoneType' object?

I'm getting this error when I run my python script: TypeError: cannot concatenate 'str' and 'NoneType' objects I'm pretty sure the 'str' means string, but I dont know what a 'NoneType' object is. My script craps out on the second …

Read More