The keywords Null and None. If you are new to programming you may think they mean zero, they do not. On first sight they look alike, so what's the difference?
Not so in Python, Python does not have a null value.
>>> x = null Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError: name 'null' is not defined >>>
Instead there is the None object. None effectively means there is no value or it is empty. Basically, NoneType is a data type just like int, float, etc.
You can see a type using
>>> print(type(int)) <class 'type'> >>> print(type(float)) <class 'type'>
You can see this for the None type too:
>>> print(type(None)) <class 'NoneType'>
Assign None value
You can see above is an object (class), in Python this None object never has any functionality. Lets define a variable with the None value
twelve = None print(twelve is None)
See the result
>>> twelve = None >>> print(twelve is None) True >>>
None means no value, not zero.
>>> print(twelve == 0) False
None and null difference
Although there is no null value in Python, you can use None like null.
>>> x = None >>> if x is None: ... print('x is null') ... else: ... print('x is not null') ... x is null
Can you redefine None to be something? No, you can't do this.
>>> None = 1 File "<stdin>", line 1 SyntaxError: can't assign to keyword
Rest assured, the value of None is always empty.
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