None" constant that is semantically the same — i.e. they're both used to represent absence of value, or no value. Therefore, you can use
None to represent null values in Python.
For example, you can assign
None to a variable in the following way:
foo = None print(foo) # None
Similarly, you can assign
None to a function/method argument (to serve as a default value), like so:
def foo(arg = None): if arg is None: return 'empty' print(foo()) # 'empty'
def foo(): return None print(foo()) # None
def foo(): pass print(foo()) # None
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