None is a singleton object (i.e. only one instance of it ever exists).
You can validate that using
None always references to the same object (no matter how many times it's called) by using Python's identity function "
id()", for example, like so:
print(id(None)) # 139898125892800 foo = None print(id(foo)) # 139898125892800 def bar(): pass print(id(bar())) # 139898125892800
The examples above show that the id of
None is the same (no matter how many times it's called), which means that they point to the same object.
None always references to the same object, you can use the
is not) operators to compare values against it:
if foo is None: # do something if foo is not None: # do something
Although, it is possible to use the equality operator (
!==) to compare against
None, it is not recommended. You should use
is not) operator instead.
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